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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 Choices a) sin7x b) cos7x c) cos9x d) sin9x
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OpenStudy (sidsiddhartha):
USE\[SIN(A-B)=SINA.COSB-COSA.SINB\]
OpenStudy (cwrw238):
use the identity sinAcosB - sinBcosA = sin(A-B)
OpenStudy (sidsiddhartha):
can u do it now? '
OpenStudy (anonymous):
@sidsiddhartha @cwrw238 I'm confused where to plug it in
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