sec x csc x- cot x=tan x Choose the correct proof below. 1 - cos X sin x cos x A. sec x csc x- cot x == 1 1 cos x sin x sin x cos x 1 - cos 2 x sin x cos x sin 2 x sinx = tan x C. sec x csc x- cot x OB. sec x csc x- cot x 1 1 COS X sin x 2 sin 2 x sin x cos x = tan x OD. sec x csc x- cot x 1 1 COS X == COS X sin x sin x 2 1- cos x = 1 1 COS X = COS X sin x sin x sin x cos x = 2 1- cos x sin x cos x sin 2 x sin x cos x = tan x sin x cos x sin 2 x = tan x