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

Find the value of 45^@ of all trigonometrically ratios geometrically. and evaluate the following . (1- tan^(2)45^@)/(1+tan^(2)45^@)

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

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

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

(1-tan^(2)45o)/(1+tan^(2)45o) is equal to tan90o(b)1(c)sin450(d)sin0o

(1-tan^(2)45)(1+tan^(2)45)= a) tan90^0 b)1 c) sin45^0 d)0

If y sin 45^0 cos 45^0 = tan^2 45^0 cos^2 30^0 then y =

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