If `tan^2theta=2tan^2phi+1`, then which one of the following is correct?

If tan' theta=2tan^(2)phi+1 ,then which one of the following is correct?

If tan^2 theta=2 tan^2 phi+1 , then which of the following is correct ?

If x = (sec^(2) theta - tan theta)/(sec^(2) theta + tan theta) , then which one of the following is correct ?

If cos^2 theta- sin^2 theta = tan^2 phi then which of the following is true ?

If a sin^(2)theta+b cos^(2)theta=m,b sin^(2)phi+a cos^(2)phi=n,a tan theta=b tan phi, then which of the following is true?

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

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

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

If tan^(2)theta=2tan^(2)phi+1 then the value of cos(2theta)+sin^(2)phi is ………..