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Prove that a) (sin3A + sinA)sinA+(cos3A...

Prove that a) `(sin3A + sinA)sinA+(cos3A-cosA) cosA=0` b) `cos20^(@)cos40^(@)cos80^(@)=1/8` c) `(sin8thetacostheta-sin6thetacos3theta)/(cos2thetacostheta-sin3thetasin4theta) = tan2theta`

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