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quester [9]
3 years ago
7

The expression cos 4xcos 3x +sin 4r sin 3x is equivalent to

Mathematics
1 answer:
iris [78.8K]3 years ago
8 0

Answer:

Step-by-step explanation:

cos 4x cos 3x+ sin 4x sin 3x=cos(4x-3x)=cos x

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