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(cos 6x + 6 cos 4x + 15 cos 2x + 10)/(co...

`(cos 6x + 6 cos 4x + 15 cos 2x + 10)/(cos 5x + 5 cos 3x + 10 cos x )` is equal to

A

cos 2x

B

cos x

C

cos 3x

D

2 cos x

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The correct Answer is:
B, C
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SURA PUBLICATION-TRIGONOMETRY-EXERCISE 3.12
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