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OpenStudy (anonymous):
i need help rewriting this equation with only sin x and cos x : sin 3x - cos x
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OpenStudy (phi):
sin(a+b)= sin(a)cos(b)+sin(b)cos(a) cos(a+b)= cos(a)cos(b)-sin(a)sin(b) let a= 2x and b= x then do it again with a=x and b=x to get rid of the 2x
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