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17 September, 10:29

Write the expression as the sine, cosine, or tangent of an angle.

sin 9x cos x - cos 9x sin x

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  1. 17 September, 10:58
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    From sin (a-b) = sin (a) cos (b) - cos (a) sin (b)

    let a=9x, b=x

    sin (9x) cos (x) - cos (9x) sin (x) = sin (9x-x) = sin (8x)
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