Establish the identity. cos (α + β) = cot a cot B- 1 sin a sin B Choose the sequence of steps below that verifies the identity. O A. cos (α + β) cos a cos B- sin a sin B cos a cos B sin a sin ß = cot a cot ß-1 sin a sin B sin a sin B sin a sin ß sin a sin B O B. cos (a + B) cos a cos ß + sin a sin ß cos a cos B sin a sin B = cot a cot B-1 sin a sin B sin a sin B sin a sin B sin a sin B OC. cos (a + B) sin a sin B+ cos a cos B sin a sin ß cos a cos B = cot a cot B-1 + sin a sin B sin a sin B sin a sin B sin a sin B OD. cos (α + β ) cos a cos ß - sin a sin B cos a cos B sin a sin B = cot a cot B- %3D sin a sin B cos a cos B cos a cos B cos a cos B

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