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?
The test description has been updated. Also, new and improved test suites are added within the scope of the problem.
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...
Find the alphabetic word product
Return elements unique to either input
Remove the two elements next to NaN value
Remove the Zero
subtract central cross
Find the function 2
frame of the matrix
Given a matrix, return the last eigen value
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