Some of my answers include "і" signs, what should I do to get a regular answer?
At first, I thought it was a problem in the cosine equations but later saw the same problem in other formulas.
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"i" indicates that this is a complex number with an imaginary part.
It is completely normal for the cases you have exposed since the square root of a negative number does not make sense in the real field (it is a complex number); in the same way, the arc-cosine makes sense in the real field only for numbers less than or equal to 1

sergio

literal 'l' is too confusing, use λ [Greek]
imaginary 'i' and ordinary 'i' are not compatible
especially in for loop... please check.

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