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...
Roll the Dice!
Return the Fibonacci Sequence
What is the distance from point P(x,y) to the line Ax + By + C = 0?
Set the array elements whose value is 13 to 0
Area of an equilateral triangle
frame of the matrix
Fermat's Last Theorem - Fermat's conjecture
Given a matrix, return the last eigen value
subtract central cross
Center of mass
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