Prove that
To prove: tan( )+ tan( ) = 2secx
Proof: Consider, L.H.S = tan( )+ tan( )
tan( )+ tan( ) = +
()
= +
=
By Expanding the numerator we get,
= ()
tan( )+ tan( ) = 2secx = R.H.S
since L.H.S = R.H.S, Hence proved.