$$f ( x ) = 3 x ^ { 4 / 5 }$$
$\frac{12}{5\sqrt[5]{x}}$
$$\frac{4}{5}\times 3x^{\frac{4}{5}-1}$$
$$\frac{12}{5}x^{\frac{4}{5}-1}$$
$$\frac{12}{5}x^{-\frac{1}{5}}$$
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$3x^{\frac{4}{5}}$
