Updates:
Labels: smichr NeedsReview
Comment #4 on issue 2849 by smi...@gmail.com: integration of
cos(x)/sin(x)**n
http://code.google.com/p/sympy/issues/detail?id=2849
The solution now looks like this after mods of
https://github.com/sympy/sympy/pull/772 :
diff(integrate(cos(x)/sin(x)**7, x), x)
(36*sin(x)*cos(x)**5 - 72*sin(x)*cos(x)**3 + 36*sin(x)*cos(x))/(6*cos(x)**6
- 18
*cos(x)**4 + 18*cos(x)**2 - 6)**2
trigsimp(_)
cos(x)/sin(x)**7
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