February 20, 2017

Homework Help: Trigonometry

Posted by Tommy on Saturday, July 19, 2008 at 1:03am.

Prove the identity

sin(x+y+z)+sin(x+y-z)+sin(x-y+z)+ sin(x-y-z) = 4 sin(x)cos(y)cos(z)

This identity is so long and after i tried to expand the left side and it just looked something crap

Thanks for you help :)

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