If `sec(theta+alpha)+sec(theta-theta)=2sec(theta)`

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

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 = 2sectheta, costheta is equal to :

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

If sec(theta-alpha), sectheta and sec(theta+alpha) are in AP, where cos alpha ne 1 then what is the value of sin^2 theta + cos alpha ?

If sec ( theta + alpha ) , sec theta , sec (theta - alpha ) are in A.P. Then cos theta sec alpha //2=

If sec ( theta - alpha ) , sec theta , sec ( theta + alpha ) are in A.P. then cos theta =

sec4theta - sec2theta=2