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?
The test description has been updated. Also, new and improved test suites are added within the scope of the problem.
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...
Which doors are open?
Maximum running product for a string of numbers
Back to basics 7 - Equal NaNs
Return the Fibonacci Sequence
Multiply 2 numbers
Find the function
Fermat's Last Theorem - Fermat's conjecture
Inverse of Hilbert matrix
Distance of the centroids of the balls
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