sin teta -2 sin^3 teta / 2cos^3 teta - cos teta = tan teta
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sin teta ( 1 - 2 sin^2 teta ) / cos teta ( 2cos^2 teta - 1) = tan teta
sin teta ( cos^2 teta- sin^2 teta) / cos teta ( cos^2 teta - sin^2 teta ) =tan teta
sin teta/ cos teta = tan teta
tan teta = tan teta
LHS = RHS
Hence proved
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