This problem has been polished along with an enhanced test suite.
Select every other element of a vector
Finding Perfect Squares
Compute a dot product of two vectors x and y
Draw 'O' !
Convert array of decimal numbers into binary numbers array.
Find product of eigenvalues of n*n magic matrix.
Opposite task convert binary numbers array into array of decimal numbers.
Display positive elements of matrix.
Find cosine between two given vectors u and v.
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