[" If "tan^(2)theta=1+2tan^(2)theta" .prow that "],[cos2 phi=1+2cos2 theta]

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If tan^(2)theta=1+2tan^(2)phi, prove that cos2 phi=1+2cos2 theta

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

If tan^(2)theta=1+2tan^(2)phi then show that cos2 theta+sin^(2)phi=0

If tan^(2)theta=2tan^(2)phi+1, prove that cos2 theta+sin^(2)phi=0

If tan^2theta=1+2tan^2phi ,show that cos2phi=1+2cos2theta

If" " tan^(2) theta = 1 + 2 tan^(2) phi, "show that", cos 2theta + sin^(2) phi = 0.

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

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

If tan^(2)theta=2tan^(2)phi+1, then cos2 theta+sin^(2)phi is equal to