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TRIGONOMETRY: Quick Question Please Help?
The question asks: Express the sum or difference as a product of sines and/or cosines.
(cos 7theta)/2+ (cos5theta)/2
1 Answer
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- svLv 71 decade agoFavorite Answer
(cos 7theta)/2+ (cos5theta)/2 = cos(7+5)theta/2cos(7--5)theta/2
= cos6thetacostheta.
if it is cos(7theta/2) + cos(5theta/2) = 2cos3thetacostheta/2
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