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

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

A

`cos ^(2) x`

B

`1+cos x`

C

`cos 2 x`

D

`2 cos x`

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