Reverse the elements of an array
sum of first 'n' terms
Test Problem; Create a 5x5 array containing all ones
Form a square matrix from four square sub-matrices
Find the sides of an isosceles triangle when given its area and height from its base to apex
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Count given word x in text.
Divide polynomial p1 by p2.
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