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(1- tan^(2) 45^(@))/(1+ tan^(2) 45^(@))=...

`(1- tan^(2) 45^(@))/(1+ tan^(2) 45^(@))=`

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(1-tan^(2)(45^(@)-A))/(1+tan^(2)(45^(@)-A)) is equal to

(1 - tan^2 45^0)/(1 + tan^2 45^0)

(1-tan^(2)(45^(@)-theta))/(1+tan^(2)(45^(@)-theta))=

( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

( 2tan 30 ^(@) )/( 1+tan ^(2) 45^(@) ) =

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