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

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

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

Solve : (1- tan^2 theta)/(tan^2 theta)

Find the sum n terms of seires tan theta + (1) / (2) (tan theta) / (2) + (1) / (2 ^ (2)) (tan theta) / (2 ^ (2)) + ( 1) / (2 ^ (3)) (tan theta) / (2 ^ (3)) +

Show that : (1+ tan theta/2)/(1-tan theta/2) = (1+sin theta)/(cos theta) = tan (pi/4 + theta/2)

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

If tan theta + (1)/(tan theta) = 2, then tan^2 theta + (1)/(tan^2 theta) is equal to