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Precalculus 7 Online
OpenStudy (anonymous):

Write the expression as the sine, cosine, or tangent of an angle. cos 8x cos 2x - sin 8x sin 2x

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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