" prone that "1-cos^(2)theta(1+tan^(2)theta)=1

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

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

If theta=30o, verify that: ( i )cos2 theta=(1-tan^(2)theta)/(1+tan^(2)theta)( ii) cos3 theta=4cos^(3)theta-3cos theta

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

If tan^4theta+tan^2theta=1 , prove that, cos^4 theta+cos^2theta=1

If tan^4theta - tan^2 theta= 1 , then prove that cos^4theta+ cos^2theta = 1

cos 2 theta is not equal to ................... A) 2 cos ^(2) theta -1 B) 1- 2 sin ^(2) theta C) (1+ tan ^(2) theta)/( 1- tan ^(2) theta) D) (1- tan ^(2) theta)/(1+ tan ^(2) theta)

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