Updates:
Status: Accepted
Labels: Milestone-Release0.6.4
Comment #1 on issue 1240 by ondrej.certik: sin(atan(x)) and cos(atan(x))
are not simplified
http://code.google.com/p/sympy/issues/detail?id=1240
Some of this is already implemented, for example:
In [1]: sinh(atanh(x))
Out[1]:
x
───────────
⎽⎽⎽⎽⎽⎽⎽⎽
╱ 2
╲╱ 1 - x
So this should be implemented for trigonometric functions as well. If you
want to
help us with this, implement this in the same way as these commits:
http://git.sympy.org/?p=sympy.git;a=commitdiff;h=3ba7fbec77add069d6
http://git.sympy.org/?p=sympy.git;a=commitdiff;h=865d6a48d0711e7182c2f4b5d5
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