Change given string to number. (hint: there is already function)
Changing from ['1234'] to  is one of example
Please expand the test suite so that solutions like this do not work.
All your base are belong to us
Find the sum of the elements in the "second" diagonal
length of a vector
Evaluating a polynomial
Cumulative product of a vector
Calculate area of sector
Solve the system of linear equations
Calculate numerical integration.
Change matrix to vector
Extract a specific part of matrix!
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