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" 36.If "tan^(2)theta=1+2tan^(2)phi" pro...

" 36.If "tan^(2)theta=1+2tan^(2)phi" prove that "cos2 phi=1+2cos2 theta

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

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

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

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

If t a n^2theta=2tan^2phi+1 , prove that cos2theta+sin^2phi=0.

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

If 3tan theta tan phi=1. Prove that 2cos(theta+phi)=cos(theta-phi)

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+phi)=cos (theta-phi) .

If 3 tan theta tan phi=1 , then prove that 2 cos (theta+phi)=cos (theta-phi) .

If cos^2theta- sin^2theta= tan^2 phi , then prove that cos^2phi – sin^2phi= tan^2theta