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6. Let f(x) = 1. (a) (8 points) Use the definition of the derivative to find f'(x). If you don't know how to do this or get the wrong answer (you should know the correct answer), then take the derivative using derivative laws for 1 point. (b) (3 points) Use your answer from the first part to find the equation of the tangent line to f(x) at r=1