If `sec(theta +alpha)+sec(theta-alpha = 2sectheta, costheta` is equal to :

If sec(theta+alpha)+sec(theta-alpha)=2/costheta . then cos^2theta is equal to

If sec(theta+alpha)+sec(theta-alpha)=2sec theta, prove that cos theta=+-sqrt(2)(cos alpha)/(2)

If sec(theta+alpha)+sec(theta-alpha)=2sec theta and cos alpha!=1 , prove that cos theta=+-sqrt"cos"(alpha)/2

If sec(theta+alpha)+sec(theta-alpha)=2sec theta then show that cos^(2)theta=1+cos alpha

If sec(theta+alpha)+sec(theta-alpha)=2sec theta then show that cos^(2)theta=1+cos alpha

If sec(theta+alpha)+sec(theta-alpha)=2\ s e ctheta, prove that costheta=+-sqrt(2)cosalpha/2dot

sec^(4) theta - sec^(2) theta is equal to

sec^107 theta+ cos^107 theta = 2," then " (sectheta + cos theta) is equal to :