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...
Make a checkerboard matrix
01 - Scalar variables
04 - Scalar Equations 2
Find and replaces spaces from a input string with *
Matlab Basics - Absolute Value
Given a matrix, return the last eigen value
Inverse of Hilbert matrix
Fermat's Last Theorem - Fermat's conjecture
Distance of the centroids of the balls
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