1.

Prove the following : (1-tan^2(45^@-A))/(1+tan^2(45^@-A)) = sin2A

Answer»

Solution :L.H.S.
`(1-tan^2(45^@-A))/(1+tan^2(45^@-A)) = COS2(45^@-A)`
= COS(`90^@`-2A) = SIN2A= R.H.S.


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