Status: Valid
Owner: ----
Labels: Type-Defect Priority-Medium Simplify
New issue 3826 by asmeu...@gmail.com: trigsimp can't reverse tan double
angle formula
http://code.google.com/p/sympy/issues/detail?id=3826
In [71]: trigsimp(expand_trig(tan(2*x)))
Out[71]:
2⋅tan(x)
─────────────
2
- tan (x) + 1
I would have expceted tan(2*x)
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