IT a sin x + b Cos (X + 0) + b cos (x - 0) = d, then the minimum value of cos O is equal to
(B) 1. Vd? - a?
2b
(A)
(C)
Vaz -a?
Vo? - a?
(D) none of these
2 dl

IT a sin x + b Cos (X + 0) + b cos (x - 0) = d, then the minimum value of cos O is equal to
(B) 1. Vd? - a?
2b
(A)
(C)
Vaz -a?
Vo? - a?
(D) none of these
2 dl