Remove all the words that end with "ain"
Rotate a Matrix
Generate a NaN...on purpose
Find the area of a triangle
Display positive elements of matrix.
Form a square matrix from four square sub-matrices
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.
Find cosine between two given vectors u and v.
Opposite task convert binary numbers array into array of decimal numbers.
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