$\frac{2ab^2}{4b^{-2}}$
$-84-23-90+54-44$
$\frac{dy}{dx}=\frac{3x^{2}}{e^{2y}}$
$\left(7+5xy\right)\left(7-5xy\right)$
$\frac{du}{dr}=\frac{ur+3u-2r-6}{ur+5u-4r-20}$
$a^4\:-\:64$
$z^3-16$
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