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8sinthetacosthetacos2thetacos4theta=sinx...

`8sinthetacosthetacos2thetacos4theta=sinx` the x=

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`8sinthetacosthetacos2thetacos4theta`
`2(2sintheta*costheta)(2cos2thetacos4theta)`
`2(sin2theta)(cos6theta+cos2theta)`
`(sin8theta-sin4theta)+sin4theta`
`sin8theta=sinx`
`x=8theta`.
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