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Use the definition f '(x) = lim tends to 0 (f(x+h) - f(x) / h) to...

Use the definition f '(x) = lim tends to 0 (f(x+h) - f(x) / h) to find
a. The derivative of f(x) = x + (30/x)
b. The derivative of f(x) = 3x^2- 5x + 30

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