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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. sin 9x cos x - cos 9x sin x sin 10x cos 8x sin 8x cos 10x
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OpenStudy (ksaimouli):
sin(x-y)
OpenStudy (ksaimouli):
which is
OpenStudy (ksaimouli):
sin 8x
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