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Compute the derivative of a given function

Compute the derivative of

    \[ f(x) = \frac{1}{x} + \frac{2}{x^2} + \frac{3}{x^3}. \]


Using the formula for the derivative of an integral power of x, we compute

    \[ f'(x) = -\frac{1}{x^2} - \frac{4}{x^3} - \frac{9}{x^4}. \]

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