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| $I$. $f'(x) = \frac{3}{4}x^{4/3} + 9$ | $II$. $f(x) = \frac{9}{28}x^{7/3} - 2$ |
| $III$. $f(x) = \frac{9}{28}x^{7/3} + 6$ | $IV$. $f'(x) = \frac{3}{4}x^{4/3} - 4$ |
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