I know there are some of you that are interested in the simplification of trig args. Could you do a review of the file trigonometric.py (2nd to last commit in [ https://github.com/sympy/sympy/pull/281 ])? Things like cos(3*pi*i) -> cos(pi*i) automatically when i is an integer. If i is an even integer then it simplifies to 1. Also, there was an error lurking in cot where cot(pi*i) wasn't going to zoo, only the literal cot(2*pi) was.
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