`" If "tanh^(2)(x)=tan^(2)(theta/2)" then "cosh2x=`

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

If x=log_e tan(pi/4+theta/2) then prove that (i) tanh(x/2)=tan(theta/2) and (ii) cos theta* cos hx=1

If x sin theta = y cos theta = (2z tan theta) / (1-tan ^ (2) theta), then 4z ^ (2) (x ^ (2) + y ^ (2)) =

If x sin theta = y cos theta = ( 2 z tan theta)/(1 - tan ^(2) theta) , then what is 4z ^(2) (x ^(2) + y ^(2)) equal to ?

(tan^(2)(2 theta)-tan^(2)theta)/(1-tan^(2)(2 theta)tan^(2)theta) is equal to-

If 4x = sec theta and (4)/(x) = tan theta then 8 (x^(2) - (1)/(x^(2))) is

Prove that (tan^(2)2theta-tan^(2)theta)/(1-tan^(2)2thetatan^(2)theta)=tan 3 theta tan theta .

Find (dy)/(dx)x=a{cos theta+(1)/(2)log(tan^(2)((theta)/(2))}y=a sin theta

If the angle between the two lines y^(2)+kxy-x^(2)tan^(2) theta=0 is 2 theta then k=