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

tan2 theta xx tan theta=1

((1+i tan theta)/(1-i tan theta))^(n)-(1+i tan n theta)/(1-i tan n theta)=

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

Prove that : (tan theta)/(1 -cot theta) + (cot theta)/(1- tan theta) = 1 + cos theta cosec theta

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

tan2 theta tan theta=1

Prove the trigonometric identities: (tan theta)/(1-cot theta)+(cot theta)/(1-tan theta)=1+tan theta+cot theta

Prove that (1+sin2 theta)/(1-sin2 theta)=((1+tan theta)/(1-tan theta))^(2)