Status: New
Owner: ----
Labels: Type-Defect Priority-Medium

New issue 1676 by b.berret: simplification of type sin x.cos y + cos x.sin  
y =  sin (x + y)  does't work
http://code.google.com/p/sympy/issues/detail?id=1676

Hi everybody,

Simplifying the following trigonometric formula does not work for me.

For instance, the commands:
trigsimp(sin(x)*cos(y)+cos(x)*sin(y))
or
trigsimp(sin(x)*cos(y)+cos(x)*sin(y),deep=True,recursive=True)

do not yield the expected result that is to say sin(x+y)

For instance, this works perfectly in Maple  with the combine(...,trig)
command (not tested with others, but I guess it also work, since it is a
standard trig simplification).

Regards,
Bastien

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