Status: Accepted
Owner: ----
Labels: Type-Defect Priority-Medium
New issue 2999 by [email protected]: expand(trig=True) could process Floats
http://code.google.com/p/sympy/issues/detail?id=2999
The following is unchanged
sin(2.*x).expand(trig=True)
sin(2.0*x)
while the Integer variant is changed
sin(2*x).expand(trig=True)
2*sin(x)*cos(x)
Is there a reason not to return `2.0*sin(x)*cos(x)`?
The same sort of thing applies to
cos(2.0*x).expand(trig=True)
cos(2.0*x)
which, for the Integer variant, gives
cos(2*x).expand(trig=True)
2*cos(x)**2 - 1
This stems from looking only for Rationals in trigonometric's
_eval_expand_trig routines.
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