The expression (cos 6x+6cos 4x+15 cos...

The expression
`(cos 6x+6cos 4x+15 cos 2x+10)/(cos 5x+5 cos 3x+10 cos x)`

A

`cos 2x`

B

`2 cos x`

C

`cos ^(2) x`

D

`1+ cos x`

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The correct Answer is:

C

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