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 1D
Determine Whether an array is empty
Arrange vector in ascending order
Divide by 4
Find the function 2
subtract central cross
Fermat's Last Theorem - Fermat's conjecture
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