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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. cos 8x cos 2x - sin 8x sin 2x
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OpenStudy (anonymous):
Looks like a cosine sum identity . . .
OpenStudy (anonymous):
yes.. use the identity: \(\large cos(A+B)=cosAcosB-sinAsinB \)
OpenStudy (anonymous):
So the answer is Cos(8x+2x)= cos 10x. correct
OpenStudy (anonymous):
@CliffSedge @dpalnc ?
OpenStudy (anonymous):
yes
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