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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
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      <p bold="true">Tangent, normal and binormal vectors</p>
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        <p>Поворот на угол α вокруг оси OX </p>
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        <e type="function" args="2">el</e>
        <e type="operand">i</e>
        <e type="function" args="2">el</e>
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        <e type="operand">a</e>
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        <e type="function" args="3">el</e>
        <e type="operand">1</e>
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        <e type="function" args="3">el</e>
        <e type="operand">1</e>
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        <e type="operand">k</e>
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        <e type="operand">c</e>
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        <e type="function" args="3">el</e>
        <e type="operand">1</e>
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        <e type="function" args="11">mat</e>
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        <e type="operand">k</e>
        <e type="operand">3</e>
        <e type="function" args="3">el</e>
        <e type="operand">a</e>
        <e type="operand">k</e>
        <e type="operand">1</e>
        <e type="function" args="3">el</e>
        <e type="operand">1</e>
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        <e type="operand">k</e>
        <e type="operand">3</e>
        <e type="function" args="3">el</e>
        <e type="operand">b</e>
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        <e type="function" args="3">el</e>
        <e type="operand">c</e>
        <e type="operand">k</e>
        <e type="operand">1</e>
        <e type="function" args="3">el</e>
        <e type="operand">1</e>
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        <e type="operand">3</e>
        <e type="function" args="11">mat</e>
        <e type="function" args="1">det</e>
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        <e type="function" args="3">el</e>
        <e type="operand">a</e>
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        <e type="function" args="3">el</e>
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        <e type="operand">1</e>
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        <e type="function" args="3">el</e>
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        <e type="function" args="3">for</e>
        <e type="operand">6</e>
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        <p>Viviani's curve</p>
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