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

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

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

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

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

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

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

(1 + tan ^ (2) (45 ^ (@) - A)) / (1-tan ^ (2) (45 ^ (@) - A)) = csc2A

(1 + tan ^ (2) (45-A)) / (1-tan ^ (2) (45-A)) = cos ec2A

tan (45 ^ (@) + A) + tan (45 ^ (@) - A) =