Show that : ((cos theta - cos 3 theta )(...

Show that : `((cos theta - cos 3 theta )(sin 8theta + sin 2theta))/((sin5theta- sintheta)(cos 4theta - cos6theta))`=1

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LHS
`(2sin2thetasin(-theta)2sin5theta*costheta)/(2sin2theta*cos3theta2sin5thetasin(-theta)`
`1`
RHS.

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