sec x csc x- tan x-cot x hoose the correct proof below. OA. sec x csc x- tan x = 1 1 cos x sin x sin x cos x 2 1- sin x sin x cos x cos 2 = cot x X OC. sec x csc x- tan x 1 1 = . sin x cos x sin x 1- sin 2 X sin x cos x cos 2 x sin x cos x = cot x cos x OB. sec x csc x- tan = 1 . 1 cos X sin x 1- sin 2 X sin x cos x 2 cosx sin x cos x = cot x OD. sec xcsc x- tan 1 1 = cos x sin x sin x cos x 1- sin 2 sin x cos x cos 2 = cot x X