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Question 1 [continued] (b) Use the following definition of derivative f'(x) = lim f(x th) -f(x) h to find the derivative of cos . X
Question 1 [continued] (b) Use the following definition of derivative f'(x) = lim f(x th) -f(x) h to find the derivative of cos . X [4] [ You may use the identity A+ B A- B cos A - cos B = -2sin 2 sin 2
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