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OpenStudy (anonymous):
Rewrite with only sin x and cos x. sin 3x
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OpenStudy (anonymous):
sin3x = sin(2x+x) = sin(2x)cosx + cos(2x) sinx = .... More hints: sin2x = 2sinxcosx cos2x = 1-2sin^2x
OpenStudy (anonymous):
so is it sin x cos2x - sin3x + cos3x?
OpenStudy (anonymous):
No..
OpenStudy (anonymous):
change sin2x into 2sinxcosx and change cos2x into 1-2(sinx)^2
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