Updates:
Status: Invalid
Comment #1 on issue 1574 by asmeurer: missing trig identity
http://code.google.com/p/sympy/issues/detail?id=1574
You need to use trigsimp():
>>> trigsimp(sin(x)**2 + cos(x)**2)
1
Perhaps simplify() should be calling trigsimp, along with all of the other
functions it calls.
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