Prove this equation
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your question...
(sintheta - 2sin³theta)/(2cos³theta-costheta)
sintheta (1-2sin²theta)/cos2theta(2cos²theta-1)
Such that...
1-2sin²theta= cos2theta
2cos²theta-1=cos2theta
sintheta.cos2theta/cos2theta.cos2 theta
=sintheta/cos2theta
=tan theta
proved your question
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