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...
Spot the outlier
Max index of 3D array
Concatenate two strings
Distance of the centroids of the balls
Given a matrix, return the last eigen value
Inverse of Hilbert matrix
Find the function 2
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