Find the fourier transform of a given input vector
for ex a=[1 2 3 4]
then y=[ 10.0000 + 0.0000i -2.0000 + 2.0000i -2.0000 + 0.0000i -2.0000 - 2.0000i]
Sum all integers from 1 to 2^n
Matrix indexing with two vectors of indices
Calculate the area of a triangle between three points
Area of a circle
Maximum value in a matrix
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