Use the definition of the derivative to show f'(x) = 2x + 2 if f(x) = x² + 2x This means the "long way" by substituting into the

Question

Use the definition of the derivative to show f'(x) = 2x + 2 if f(x) = x² + 2x This means the "long way" by substituting into the limit: f'(x) = lim h→0 f(x+h)-f(x) / h

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