In addition to the weak test suite: The title of the problem says "Sinus function", yet the (incomplete) problem description mentions only "cosine" ??? Furthermore, should abs(cos(-x)) be assigned to y, or to z?
Please improve the test cases. Returning 1 and -1 is complete enough with these sloppy tests.
bad test suite
The test suite is not very rigorous...
Create a square matrix of multiples
Return area of square
find the maximum element of the matrix
find the roots of a quadratic equation
construct matrix with identical rows
Find the function 2
Center of mass
Distance of the centroids of the balls
subtract central cross
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