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The expression cos4xcos3x+sin4xsin3x is equivalent to? A. sin x B. sin7x C. cos x D. cos7x
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The expression cos4xcos3x+sin4xsin3x is equivalent to?

A. sin x
B. sin7x
C. cos x
D. cos7x

User BoJack Horseman
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1 Answer

4 votes

Try this solution:

cos4xcos3x+sin4xsin3x=cos(4x-3x)=cosx.

Answer: C

User Mmccabe
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8.5k points
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