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OpenStudy (anonymous):
Write the expression as the sine, cosine, or tangent of an angle. cos 107° cos 42° + sin 107° sin 42°
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OpenStudy (anonymous):
These are the answers sin 65° cos 65° cos 149° sin 149°
OpenStudy (anonymous):
No this is not about triangles I'm afraid.
OpenStudy (anonymous):
just use the identities like \[\huge \cos(A-B)=\cos A \cos B + \sin A \sin B\]
OpenStudy (anonymous):
So cos(107-42)?
OpenStudy (anonymous):
yes!
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OpenStudy (anonymous):
Yay which equals 65! Thanks!
OpenStudy (anonymous):
welcome!
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