Display positive elements of matrix.
The Goldbach Conjecture
Sum the numbers on the main diagonal
Side of a rhombus
Count given word x in text.
Replace x value into y value in string text.
Delete x value in given vector y.
Multiply two polynomials p and q given in in vector representation.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
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