Change the sign of even index entries of the reversed vector
select the primes of a vector
Find the area of a triangle
Height of a right-angled triangle
Find hen's weight.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Set x value to each odd index of vector y.
Find Euclidean norm of given vector u.
Convert array of decimal numbers into hexadecimal numbers array.
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