Updates:
Status: Fixed
Comment #9 on issue 1676 by smi...@gmail.com: simplification of type sin
x.cos y + cos x.sin y = sin (x + y) does't work
http://code.google.com/p/sympy/issues/detail?id=1676
The equation in comment 6 solves with an op count of 106; the trig pattern
in the OP is now recognized:
trigsimp(sin(x)*cos(y)+cos(x)*sin(y))
sin(x + y)
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