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OpenStudy (anonymous):
Rewrite with only sin x and cos x. sin 2x - cos x
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OpenStudy (anonymous):
2 sin x cos2x sin x cos x (2 sin x - 1) 2 sin x
OpenStudy (anonymous):
we know that sin2x=2sinx *cosx so therefore 2sinx*cosx-cosx =cosx(2sinx-1)
OpenStudy (anonymous):
taking the cosx out in common
OpenStudy (anonymous):
ok do we cancel them?
OpenStudy (anonymous):
no
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