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

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

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

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

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

tan(45^(@)+A)tan(45^(@)-A)=1

(sin60^(@)+sin30^(@))/(sin60^(@)-sin30^(@))=(tan60^(@)+tan45^(@))/(tan60^(@)-tan45^(@))

If (2tan^(2)30^(@))/(1-tan^(2)30^(@))+sec^(2)45^(@)-sec^(2)0^(@)=xsec60^(@) , then the value of x is

tan225^(@)=tan(180^(@)+45^(@)) =tan45^(@)=1