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

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

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Nr: cos 6x + cos 4x + 5 cos 4x + 5 cos 2x + 10 cos 2x + 10 

= 2 cos 5x cos x+5(2 cos 3x cos x)+ 10(2 cos2 x) 

= 2 cos x [cos 5x + 5 cos 3x + 10 cos x]

= cos 2x

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