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Which of the following is the derivative of the function f (x) = sin x . (1 - cos z)? O A. f' (x) = cos x . sin c O B. f' (x) = - cos x . sin O c. f' (x) = cos x + cos x . sin c O D. f' (x) = cos x - cos2 x - sin a O E. f' (x) = cosx - cos2 x + sin z