Establish the identity. cotu-cscu= - sin u 1 + cos u Which of the following statements establishes the identity? OA. cot ucscu=- cos u 1 sin u sin u cos u-1 sin u cos u+1 cos u +1 = 2 cos u-1 sin u(cos u + 1) sin u(cos u+1) - sin2u sin u cos u +1 ○ B. sin u 1 sin u-1 cot u- cscu= = cos u cos u cos u sin u + 1 sin u + 1 = sin 2 u+1 cos u(sin u + 1) sin u cos u +1 ○ C. cotu- cscu=- cos u 1 sin u = sin u cos u-1 sin u cos u+1 cos u +1 COS 2u+1 2 sinu sin u = sin u(cos u+1) sin u(cos u+1) cos u + 1

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