If `alpha+beta+gamma=2 theta`,then `cos theta + cos(theta - alpha) + cos(theta - beta) + cos(theta - gamma)` =

If alpha + beta + gamma = 2 theta , prove that cos theta + cos(theta- alpha) + cos(theta- beta) + cos(theta -gamma) = 4(cos (alpha/2) cos (beta/2) cos (gamma/2))

If alpha +beta + gamma = 2theta then costheta+ cos(theta-alpha)+cos(theta-beta)+ cos(theta-gamma)

If alpha+beta+gamma= 2theta., then costheta+ cos(theta-alpha)+ cos(theta-beta)+cos(theta-gamma)

If cos 3 theta = alpha cos theta + beta cos ^(3) theta, then (alpha, beta) =

It is given that cos(theta-alpha)=a, cos(theta-beta)=b What is cos(alpha-beta) equal to ?

If cos theta = cos alpha cos beta, "then tan" (theta - alpha)/(2) is equal to

If cos theta = cos alpha cos beta , " then " cot^(2)""(beta)/(2)=

If alpha, beta , gamma do not differ by a multiple of a pi and if ( cos (alpha + theta))/( sin (beta + gamma)) = (cos (bega + theta))/( sin (gamma + alpha )) = (cos (gamma + theta))/( sin (alpha + beta)) = k. Then k equals