Comment #5 on issue 1395 by [email protected]: trigsimp doesn't simplify an expression that == 1
http://code.google.com/p/sympy/issues/detail?id=1395
In PR 1690, recursive doesn't work but a double application of trigsimp does work:
eq
sin(q3)**2*sin(q4)**2 + cos(q3)**2*cos(q4)**2*tan(q4)**2 + cos(q4)**2
trigsimp(eq)
sin(q3)**2*sin(q4)**2 - cos(q3)**2*cos(q4)**2 + cos(q3)**2 + cos(q4)**2
trigsimp(eq,recursive=1)
sin(q3)**2*sin(q4)**2 - cos(q3)**2*cos(q4)**2 + cos(q3)**2 + cos(q4)**2
trigsimp(trigsimp(eq))
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