Sin A - 2 sin³ A / 2 cos³ A - cos A = tan A .
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sin A((1- sin 2a) - sin 2a)/cos a( Cos 2a
+(cos 2a-1))=sin a(cos 2a-sin 2a)/cos a(
cos 2a-sin 2a)=sin a/cos a= tan a
sin A((1- sin 2a) - sin 2a)/cos a( Cos 2a
+(cos 2a-1))=sin a(cos 2a-sin 2a)/cos a(
cos 2a-sin 2a)=sin a/cos a= tan a
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