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...
Extract leading non-zero digit
vectorization in N
Back to basics 6 - Column Vector
Create matrix of replicated elements
Volume of a box
Find the function
Find the function 2
subtract central cross
frame of the matrix
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