$\frac{\frac{8}{n}-n^{2}}{\frac{4}{n}-n}$
$\frac{1}{4}r^{\frac{1}{2}}-\frac{4}{9}i^{2}$
$\frac{4.2x^7y^3z^2}{0.6x^3y^4z^2}$
$\pi\cdot\left(x^2+16\right)\cdot20$
$2x^2-13x-21$
$y'=e^{-y}$
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