Question

Cos x = cos a cos b prove that tan x+a/2 tan ( x-a)/2 = tan^2 b/2

Answer 1

Answer:

(b2-a2) + (a2-b2)cos2x (a + b cos x)2 (b2-a2)( l-cos2 x) (a +b cos x) (b2-a2)sin2 x (a + ... 2 sin x a + b cos x a + b cos x b+ a cos x + Vb2 - a2 sin x log a + b cos x 1-tan2* b+a .