Comment #3 on issue 1676 by yeus66: 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
this is really annoying when working with differential equations etc...
This is a
very often used identity used in many applications... sympy can not solve
most "real
life" trigonometric equations because of this.
(I am working in the robotics field and sympy is almost impossible to use
for me
because of this problem)
for example solving a simple equation like this will not work...:
a₂⋅cos(θ₂) + a₃⋅cos(θ₂)⋅cos(θ₃) - a₃⋅sin(θ₂)⋅sin(θ₃)
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