K Prove the given identity sec x csc x sin x sec x cos x CSC X Choose the correct proof below OA sec x csc x sin x sec x 1 1 cos X sin x sin x cos x 1 sin x 2 sin x cos X COS X cos X CSC X cos X sin x 2 1 sin x OC sec xcsc x sin x sec x 1 1 sin x sin x cos x 2 cos X sin x sin x cos x cos x CSC X 1 cos X 1 cos X OB sec x csc x sin 1 1 cos x sin X sin x cos X 1 sin X sin x cos x 2 COS X COS X CSC X 1 OD sec x csc x sin 1 COS X sin x 2 1 sin X sin x cos x 2 COS X sin x cos X COS X CSC X