If `tanh^2 x = sec theta`, then cosh 2x =

If tanh^2 x = sin^2 theta , then sech x =

"I : If tanh"^2 x = sin^2 theta" then sech x = cos "theta "II : coth x = sec " theta" cosech x = sin " "theta"

If cosh x = sec theta , then x =

If tanh^(2)x=cos theta then cosh2x=

If tanh^(2)(x)=tan^(2)theta then cosh(2x)=

If cosh x = cos theta, then tanh^2 x/2 =

If cosh x = 3//4 , then cosh 2x =

If x = log [ tan (pi/4 + theta/2 ) ] then cosh x =

If sin x cosh y = cos theta, cos x sinh y = sin theta then sinh ^ (2) y =

If sin x sinh y = cos theta, cos x coshy = sin theta then cosh^2 y + cos^2 x=