Updates:
Labels: Simplify
Comment #9 on issue 2949 by [email protected]: trig functions do not
return exact results for half angles
http://code.google.com/p/sympy/issues/detail?id=2949
Memoizing results is fine if it would otherwise be too slow (exponential
time). See the @recurrence_memo decorator in
sympy/utilities/memoization.py.
Regarding when to evaluate, how about evaluating when the result is simple,
and otherwise only do it with trigsimp() or expand(trig=True) or
expand(func=True) (not sure which of these should do it).
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