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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. sin 8x cos x - cos 8x sin x a.sin 7x b.cos 7x c.cos 9x d.sin 9x
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OpenStudy (anonymous):
can someone please help?:(
OpenStudy (anonymous):
you have the formula for this. It's sina cosb - sinb cos a = sin (a-b). a = 8x, b = x. so the solution is your a.) sin 7x.
OpenStudy (anonymous):
@Hoa thanks!!
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