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3.1 Defining the Derivative OPEN Turned in automatically when due ITEMS INFO LEARNING RESOURCES CONCEPT REVIEW 28. Help me with this # 1 The slope of the tangent line to f(x) at x = a can be found by evaluating the limit f'(a) = mtan = lime-+a(f(x) - f(a))/(x - a) provided the limit exists. Use this limit to find f'(-6) given f(x) = 51 + 4. f'( -6) help (numbers) Submit