Please dont use cos(x) directly
True, but still not following the instruction. (Although not as shameless as some other submissions.)
Euler's formula is the most beautiful equation
Increment a number, given its digits
Back to basics 1 - Saving
Create a square matrix of multiples
Swap two numbers
Find the area of a triangle
Refresh your system of equations
Determinant of a 3x3 Matrix
Encode Me From The Past
Convert radians to degrees
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