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
Divisible by 5
Area of a circle
Create tangent function out of cosine only
Convert degrees to radians
Rotate matrix by -90 degrees
Create tangent function out of sine function only
Upper Matrix Mock
Refresh your system of equations
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