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OpenStudy (anonymous):
Simplify. sinx cos(x+y) - cosxsin(x+y)
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OpenStudy (jamesj):
well, what's sin(a + b) = ... ?
OpenStudy (anonymous):
i got... sinx [cosxcosy-sinxsiny] - cosx[sinxcosy+cosxsiny]
OpenStudy (jamesj):
Ok, you can go that way. Keep crunching away. OR write a = x + y then you have sin x . cos a - cos x . sin a
OpenStudy (anonymous):
Haha thank you but I still don't really understand how we get this.
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