If (cos6x+6cos4x+15cos2x+10)/(cos5x+5co...

If `(cos6x+6cos4x+15cos2x+10)/(cos5x+5cos3x+10cosx)=1` , then the smallest positive value of x(in degree ) will be

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`120^(@)`

Verified by Experts

The correct Answer is:

C

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