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Write the expression as the sine, cosine, or tangent of an angle. sin 9x cos x - cos 9x sin x
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Write the expression as the sine, cosine, or tangent of an angle.

sin 9x cos x - cos 9x sin x

User Portenez
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sin 9x cos x - cos 9x sin x = sin(9x - x) = sin 8x
User Macbert
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