" (ii) "tan^(2)theta-(1)/(cos^(2)theta)=-1

Prove the following trigonometric identities : (1+cot^2theta)(1-costheta)(1+costheta)=1 (ii) tan^2theta-1/(cos^2theta)=-1

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

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

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

If (sin theta + cos theta)/(sin theta - cos theta) = (5)/(4) , the value of (tan^(2) theta + 1)/(tan^(2) theta - 1) is

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

(1+tan^2theta)cos^2theta = …………

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)

(tan theta)/(1+cot theta)=(tan theta-1)/(2-cos ec^(2)theta)