Comment #2 on issue 3819 by [email protected]: trigsimp gives bad results
for non-commutative symbols
http://code.google.com/p/sympy/issues/detail?id=3819
Haven't figured it out but to give a simpler failing expression:
A is noncommutative
trigsimp(-sin(th)**2*A - sin(2*th)*A/2)
sqrt(2)*cos(2*th + pi/4)*A - A
(A should be A/2)
a is commutative (result is ok)
trigsimp(-a*sin(th)**2 - a*sin(2*th)/2).expand()
sqrt(2)*a*cos(2*th + pi/4)/2 - a/2
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