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Mathematics 16 Online
OpenStudy (anonymous):

Simplify. sinx cos(x+y) - cosxsin(x+y)

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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