$y=tan\left(\sqrt{7t}\right)$
$\frac{d}{dx}2xy^3+3x^2y=1$
$\left(x-y+3\right)\left(x-y-1\right)$
$4m+3\left(n+7m\right)$
$4^2+4^{-2}$
$\frac{8^{-9}}{8^{-2}}$
$2.1-1.4$
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