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...
So many choices
Vectorize the digits of an Integer
Relative ratio of "1" in binary number
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Given a matrix, return the last eigen value
Fermat's Last Theorem - Fermat's conjecture
Distance of the centroids of the balls
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