tanA(1 + sec 2A)
tan 2A
sin a + cosa
tan 2a + sec 2a
Cosa - sina
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LHS = tan A ( 1 + sec 2A )
.......= tan A ( 1 + 1/ cos 2A )
.......= tan A ( cos 2A + 1 ) / ( cos 2A )
.......= tan A ( 2 cos^2 A ) / ( cos 2A )
......= ( sin A / cos A ) ( 2 cos^2 A ) / ( cos 2A )
.......= ( 2 sin A cos A ) / cos 2A
.......= sin 2A / cos 2A
.......= tan 2A
........=RHS
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