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Evaluating a Derivative at a Point

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Let $f$ be the function given by $\displaystyle f(x) = 7x^{\frac{1}{3}} - \frac{9}{x^{\frac{2}{3}}}$ . What is the value of $f'(27)$?

A

$\displaystyle \frac{19}{81}$

B

$\displaystyle \frac{7}{27}$

C

$\displaystyle \frac{25}{81}$

D

$\displaystyle \frac{23}{81}$

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