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          <p style="color: #000000; background-color: #ff8080;">* Main problems are, when if() written in function, solve can't be used for that function.<br />* Recursive calls can't be used if line not used.<br />* If line is used (and with case), functions with recursive call can't solve.<br /><br />- Function 1 can be called recursively, but can't solve.<br />- Function 2 can't be called recursively, but can solve.<br />- Function 3 can be called recursively, but can't solve.<br />- Function 4 can't called recursively and can't solve.<br />- Using line doesn't matter with if(), can't solve with them. Serious issue.<br />- Sometimes I have to use line for functions. Because when I don't, there will be defined variables thrown outside of function. Using line automatically clears them.<br />- Sometimes recursive calls can be avoided, but only sometimes... </p>
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          <e type="operand">x</e>
          <e type="function" args="1">Γ_2</e>
          <e type="operand">120</e>
          <e type="operator" args="2">-</e>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operand">10</e>
          <e type="function" args="4">solve</e>
        </input>
        <result action="numeric">
          <e type="operand">6</e>
        </result>
      </math>
    </region>
    <region left="369" top="774" width="378" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">lastError</e>
        </input>
        <result action="numeric">
          <e type="operand" style="string">Γ_2(#) - function is not defined.</e>
        </result>
      </math>
    </region>
    <region left="621" top="801" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">t</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="621" top="819" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="621" top="837" width="129" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">i</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="621" top="855" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">g</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="612" top="873" width="138" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">a.T</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="630" top="891" width="46" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="612" top="909" width="138" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">a.T</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="18" top="963" width="51" height="32" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">a.T</e>
        </input>
        <result action="symbolic">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="153" top="981" width="589" height="59" border="true" color="#000000" bgColor="#ff8000" fontSize="10">
      <text lang="eng" width="589" fontFamily="Courier New" fontSize="10">
        <content>
          <p style="background-color: #ff8000; font-size: 14px;">
            <span style="font-size: 10px;">Remnants of functions after solve when line not used.<br /></span>
            <span style="font-size: 10px;">These could cause some troubles if not checked.<br /></span>
            <span style="font-size: 10px;">They may havoc the functions after them that has same named variables.</span>
          </p>
        </content>
      </text>
    </region>
    <region left="18" top="990" width="44" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
        </input>
        <result action="symbolic">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="18" top="1017" width="84" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">g</e>
        </input>
        <result action="numeric">
          <e type="operand">4.7422</e>
        </result>
      </math>
    </region>
    <region left="18" top="1044" width="84" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">t</e>
        </input>
        <result action="numeric">
          <e type="operand">5.2422</e>
        </result>
      </math>
    </region>
    <region left="18" top="1071" width="50" height="24" color="#000000" fontSize="10">
      <math>
        <input>
          <e type="operand">i</e>
        </input>
        <result action="numeric">
          <e type="operand">14</e>
        </result>
      </math>
    </region>
    <region left="558" top="1071" width="192" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">i</e>
          <e type="operand">g</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="function" args="5">Clear</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region top="1116" color="#000000" bgColor="#008080">
      <area single="true" collapsed="true" />
    </region>
    <region left="18" top="1134" width="401" height="360" color="#000000" bgColor="#ebebeb" fontSize="10">
      <math optimize="2" roundingMode="0">
        <description active="true" position="Top" lang="eng">
          <content>
            <p>Gamma Function_3 (if, line)</p>
          </content>
        </description>
        <input>
          <e type="operand">a</e>
          <e type="function" args="1">Γ_3</e>
          <e type="operand">a</e>
          <e type="operand">a</e>
          <e type="function" args="1">trunc</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">a</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="operator" args="1">!</e>
          <e type="operand">a</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">&lt;</e>
          <e type="operand">π</e>
          <e type="operand">π</e>
          <e type="operand">a</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">sin</e>
          <e type="operand">1</e>
          <e type="operand">a</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="1">Γ_3</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">/</e>
          <e type="operand">a.T</e>
          <e type="operand">a</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
          <e type="operand">x</e>
          <e type="operand">0.99999999999999709182</e>
          <e type="operator" args="2">:</e>
          <e type="operand">g</e>
          <e type="operand">4.7421875</e>
          <e type="operator" args="2">:</e>
          <e type="operand">i</e>
          <e type="operand">1</e>
          <e type="operand">#_p</e>
          <e type="function" args="1">length</e>
          <e type="function" args="2">range</e>
          <e type="operand">x</e>
          <e type="operand">x</e>
          <e type="operand">#_p</e>
          <e type="operand">i</e>
          <e type="function" args="2">el</e>
          <e type="operand">a.T</e>
          <e type="operand">i</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">eval</e>
          <e type="operator" args="2">:</e>
          <e type="function" args="3">for</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="operand">g</e>
          <e type="operator" args="2">+</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">eval</e>
          <e type="operator" args="2">:</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">+</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">^</e>
          <e type="operand">e</e>
          <e type="operand">t</e>
          <e type="operator" args="1">-</e>
          <e type="operator" args="2">^</e>
          <e type="operand">2</e>
          <e type="operand">π</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">sqrt</e>
          <e type="operator" args="2">*</e>
          <e type="operand">x</e>
          <e type="operator" args="2">*</e>
          <e type="bracket">(</e>
          <e type="operand">1</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="bracket">(</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">^</e>
          <e type="operand">6</e>
          <e type="operand">1</e>
          <e type="function" args="8">line</e>
          <e type="function" args="3">if</e>
          <e type="function" args="3">if</e>
          <e type="operand">1</e>
          <e type="operand">1</e>
          <e type="function" args="3">line</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="549" top="1161" width="192" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">i</e>
          <e type="operand">g</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="function" args="5">Clear</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="603" top="1197" width="139" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">0.2</e>
          <e type="function" args="1">Γ_3</e>
        </input>
        <result action="numeric">
          <e type="operand">4.5908</e>
        </result>
      </math>
    </region>
    <region left="585" top="1233" width="155" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">5.46</e>
          <e type="function" args="1">Γ_3</e>
        </input>
        <result action="numeric">
          <e type="operand">49.0839</e>
        </result>
      </math>
    </region>
    <region left="495" top="1260" width="249" height="28" color="#000000" bgColor="#ffff80" fontSize="10">
      <math error="2">
        <input>
          <e type="operand">x</e>
          <e type="function" args="1">Γ_3</e>
          <e type="operand">120</e>
          <e type="operator" args="2">-</e>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operand">10</e>
          <e type="function" args="4">solve</e>
        </input>
        <result action="numeric">
          <e type="operand">#</e>
        </result>
      </math>
    </region>
    <region left="495" top="1287" width="242" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">lastError</e>
        </input>
        <result action="numeric">
          <e type="operand" style="string">x - not defined.</e>
        </result>
      </math>
    </region>
    <region left="612" top="1314" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">t</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="612" top="1332" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="612" top="1350" width="129" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">i</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="612" top="1368" width="131" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">g</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="603" top="1386" width="138" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">a.T</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="621" top="1404" width="46" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="603" top="1422" width="138" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">a.T</e>
          <e type="function" args="1">IsDefined</e>
        </input>
        <result action="numeric">
          <e type="operand">0</e>
        </result>
      </math>
    </region>
    <region left="549" top="1449" width="192" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">i</e>
          <e type="operand">g</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="function" args="5">Clear</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="18" top="1521" width="394" height="356" color="#000000" bgColor="#ebebeb" fontSize="10">
      <math optimize="2" roundingMode="0">
        <description active="true" position="Top" lang="eng">
          <content>
            <p>Gamma Function_4 (if, no line)</p>
          </content>
        </description>
        <input>
          <e type="operand">a</e>
          <e type="function" args="1">Γ_4</e>
          <e type="operand">a</e>
          <e type="operand">a</e>
          <e type="function" args="1">trunc</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">a</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="bracket">(</e>
          <e type="operator" args="1">!</e>
          <e type="operand">a</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">&lt;</e>
          <e type="operand">π</e>
          <e type="operand">π</e>
          <e type="operand">a</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">sin</e>
          <e type="operand">1</e>
          <e type="operand">a</e>
          <e type="operator" args="2">-</e>
          <e type="function" args="1">Γ_4</e>
          <e type="operator" args="2">*</e>
          <e type="operator" args="2">/</e>
          <e type="operand">a.T</e>
          <e type="operand">a</e>
          <e type="operand">1</e>
          <e type="operator" args="2">-</e>
          <e type="operator" args="2">:</e>
          <e type="operand">x</e>
          <e type="operand">0.99999999999999709182</e>
          <e type="operator" args="2">:</e>
          <e type="operand">g</e>
          <e type="operand">4.7421875</e>
          <e type="operator" args="2">:</e>
          <e type="operand">i</e>
          <e type="operand">1</e>
          <e type="operand">#_p</e>
          <e type="function" args="1">length</e>
          <e type="function" args="2">range</e>
          <e type="operand">x</e>
          <e type="operand">x</e>
          <e type="operand">#_p</e>
          <e type="operand">i</e>
          <e type="function" args="2">el</e>
          <e type="operand">a.T</e>
          <e type="operand">i</e>
          <e type="operator" args="2">+</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">eval</e>
          <e type="operator" args="2">:</e>
          <e type="function" args="3">for</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="operand">g</e>
          <e type="operator" args="2">+</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">+</e>
          <e type="function" args="1">eval</e>
          <e type="operator" args="2">:</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="operand">0.5</e>
          <e type="operator" args="2">+</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">^</e>
          <e type="operand">e</e>
          <e type="operand">t</e>
          <e type="operator" args="1">-</e>
          <e type="operator" args="2">^</e>
          <e type="operand">2</e>
          <e type="operand">π</e>
          <e type="operator" args="2">*</e>
          <e type="function" args="1">sqrt</e>
          <e type="operator" args="2">*</e>
          <e type="operand">x</e>
          <e type="operator" args="2">*</e>
          <e type="bracket">(</e>
          <e type="operand">1</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">^</e>
          <e type="operator" args="2">*</e>
          <e type="bracket">(</e>
          <e type="operand">1.25</e>
          <e type="operator" args="2">^</e>
          <e type="operand">6</e>
          <e type="operand">1</e>
          <e type="function" args="8">line</e>
          <e type="function" args="3">if</e>
          <e type="function" args="3">if</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region left="540" top="1566" width="192" height="34" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">x</e>
          <e type="operand">i</e>
          <e type="operand">g</e>
          <e type="operand">t</e>
          <e type="operand">a.T</e>
          <e type="function" args="5">Clear</e>
        </input>
        <result action="numeric">
          <e type="operand">1</e>
        </result>
      </math>
    </region>
    <region left="639" top="1602" width="99" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math error="42" errorLocation="1">
        <input>
          <e type="operand">0.2</e>
          <e type="function" args="1">Γ_4</e>
        </input>
        <result action="numeric">
          <e type="operand">#</e>
        </result>
      </math>
    </region>
    <region left="576" top="1629" width="155" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">5.46</e>
          <e type="function" args="1">Γ_4</e>
        </input>
        <result action="numeric">
          <e type="operand">49.0839</e>
        </result>
      </math>
    </region>
    <region left="360" top="1647" width="378" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
        <input>
          <e type="operand">lastError</e>
        </input>
        <result action="numeric">
          <e type="operand" style="string">Γ_4(#) - function is not defined.</e>
        </result>
      </math>
    </region>
    <region left="486" top="1674" width="249" height="28" color="#000000" bgColor="#ffff80" fontSize="10">
      <math error="2">
        <input>
          <e type="operand">x</e>
          <e type="function" args="1">Γ_4</e>
          <e type="operand">120</e>
          <e type="operator" args="2">-</e>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operand">10</e>
          <e type="function" args="4">solve</e>
        </input>
        <result action="numeric">
          <e type="operand">#</e>
        </result>
      </math>
    </region>
    <region left="486" top="1701" width="242" height="24" color="#000000" bgColor="#ffff80" fontSize="10">
      <math>
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          <p style="background-color: #ff8000; font-size: 10px;">When Function 4 could solve or calculate, there are remnants of it. Because of not using the line before algorithm, same as Function 2. It doesn't have to be a complicated function. Even a most simple one gives those errors.</p>
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        <result action="numeric">
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        <result action="numeric">
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        <result action="numeric">
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        <result action="numeric">
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