x is the abscissa. find the absolute value of cosine of -x and the same value with changed sign.
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...
Distance walked 2D
First non-zero element in each column
Remove the two elements next to NaN value
Number of digits in an integer
Simple equation: Annual salary
Distance of the centroids of the balls
Inverse of Hilbert matrix
Fermat's Last Theorem - Fermat's conjecture
Find the function
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