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...
Return a list sorted by number of occurrences
Is my wife right? Now with even more wrong husband
Back to basics 25 - Valid variable names
Whether the input is vector?
Find the logic
Find the function
Given a matrix, return the last eigen value
Inverse of Hilbert matrix
subtract central cross
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