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OpenStudy (anonymous):
sin2(x)+sin(x)=0
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OpenStudy (anonymous):
sin 2x + sin x = 0 2sin x*cos x + sin x = 0 (identity: sin 2a = 2sin a*cos a) sin x*(2cos x + 1) = 0 sin x = 0 --> cos x = -1/2 --> x =
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