Solve given expression.
Note that this problem uses the word solve when it needs to say EVALUATE.
Also the required code to pass the tests shouldn't be available by COPY-AND-PASTE from Test Suite!
Most nonzero elements in row
Back to basics 23 - Triangular matrix
07 - Common functions and indexing 5
Sum of integers numbers
Form a square matrix from four square sub-matrices
Select primes from the matrix.
Find cosine between two given vectors u and v.
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.
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