$$\frac { x _ { 1 } ^ { 14 } r ^ { 4 } } { x ^ { 10 } r ^ { 4 } }$$
$\frac{x_{1}^{14}}{x^{10}}$
$$\frac{x_{1}^{14}}{x^{10}}$$
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$-\frac{10x_{1}^{14}}{x^{11}}$
