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

Prove each of the following identities : (i) (1- tan^(2) theta)/(1+ tan^(2) theta) = ( cos^(2) theta - sin^(2) theta) (ii) (1- tan^(2) theta)/(cot^(2) -1) = tan^(2) theta

tan2 theta xx tan theta=1

Prove that : (1 - tan^(2) theta)/(1 + tan^(2) theta) = cos^(2) theta - sin^(2) theta

Prove that (1 - tan^(2) theta)/(1 + tan^(2) theta) = cos^(2) - sin^(2) theta

Prove that (1+ tan^4 theta)/(1+ tan^2 theta) = sec ^2 theta-2 sin^2theta

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

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

Evaluate : ((1+tan theta)/(1-tan theta))^(2)