$$\frac { x } { x ^ { 2 } }$$
$\frac{1}{x}$
$$\frac{x^{1}}{x^{2}}$$
$$x^{1-2}$$
$$\frac{1}{x}$$
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$-\frac{1}{x^{2}}$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{1}{1}x^{1-2})$$
$$\frac{\mathrm{d}}{\mathrm{d}x}(\frac{1}{x})$$
$$-x^{-1-1}$$
$$-x^{-2}$$
