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OpenStudy (anonymous):
sin(a+x)=sinacosx+cosasinx It says to Differentiate both sides to get the sum identity?
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OpenStudy (anonymous):
cos(a+x)*1=sin a(-sinx)+cosa * cos x
OpenStudy (anonymous):
Don't you have to do this twice and simplify? (fg)′=f′g+fg′ I see how you got that though.
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