$$3 x ^ { 3 / 4 }$$
$\frac{9}{4\sqrt[4]{x}}$
$$\frac{3}{4}\times 3x^{\frac{3}{4}-1}$$
$$\frac{9}{4}x^{\frac{3}{4}-1}$$
$$\frac{9}{4}x^{-\frac{1}{4}}$$
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$3x^{\frac{3}{4}}$