dannymframos dannymframos

07-12-2017
Mathematics

contestada

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

Respuesta :

evgeniylevi evgeniylevi

02-08-2018

Try this solution:

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

Answer: C

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