Find the value of (cos6theta+6cos4theta ...

Find the value of `(cos6theta+6cos4theta +15cos2theta+ 10)/(cos5theta+5costheta+10costheta)`

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The value of (cos6theta+6cos4theta+15cos2theta+10)/(cos5theta+5cos3theta+10costheta) is :

(cos6 theta+6cos4 theta+15cos2 theta+10)/(cos5 theta+5cos3 theta+10cos theta)

Prove that: (cos6theta+6cos4theta+15 cos2theta+10)/(cos5theta+5cos3theta+10 costheta)=2costheta

Prove that: (cos6 theta+6cos4 theta+15cos2 theta+10)/(cos5 theta+5cos3 theta+10cos theta)=2cos theta

( cos 6 theta +6 cos 4 theta + 15 cos 2 theta + 10)/( cos 5 theta + 5 cos 3 theta + 10 cos theta)=

costheta.cos2theta.cos3theta=1/4

4costheta cos 2theta cos3theta - 2cos 4theta=1

Solve costheta+cos3theta-2cos2theta=0 .

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