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...
Increment a number, given its digits
First N Perfect Squares
find radius of cone
Count decimal digits of a number
Length of the hypotenuse
frame of the matrix
Fermat's Last Theorem - Fermat's conjecture
Center of mass
Find the function
Given a matrix, return the last eigen value
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