l'(x)=\frac{15x^{4}}{4x^{4}} - \frac{20x^{3}}{x^{5}} = \frac...

l'(x)=\frac{15x^{4}}{4x^{4}} - \frac{20x^{3}}{x^{5}} = \frac{(5)^{2}}{x^{5}}

$l'(x)=\frac{15x^{4}}{4x^{4}} - \frac{20x^{3}}{x^{5}} = \frac{(5)^{2}}{x^{5}}$

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