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

Deborah Edwards

in Mathematics

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Kaitlin Dean on September 25, 2018

Of sin(a-b) = sin(a)cos(b) - cos(a)sin(b) let a=9, b=x sin(9 x)cos(x) - cos(9 x)sin(x) = sin(9 x-x) = sin(8x)


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