$\frac{\left(-1\right)^2+2\left(-1\right)+1}{\left(-1\right)^4-1}$
$\frac{dy}{dx}=\frac{e^{-x}}{y}$
$3 x ^ { 3 } - 6 x$
$12x^3-30x^2-24x+12$
$\frac{m^{-3}n^9}{m^6n^{12}}$
$y+25=78$
$x^2y'+xy=y$
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