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1-tan^(2)A

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

sec^(-1)((1+tan^(2)x)/(1-tan^(2)x))

sin^(-1)((1-tan^(2)x)/(1+tan^(2)x))

(1-tan ^(2) 15^(circ))/(1+tan ^(2) 15^(circ))=

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

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

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

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

Value of (1-tan^(2)45^(@))/(1+ tan^(2)45^(@)) is