$\frac{n^3\left(n^4\right)^2}{2mn}$
$\lim_{x\to4}\left(\frac{x-3-\sqrt{\left(x^2-15\right)}}{\left(x-4\right)}\right)$
$\int\frac{-10x+4}{7x+x^2+12}dx$
$4a^{12}-9b^6$
$7m+10+8-2$
$d^2+5d$
$\frac{d^2}{dx^2}\left(1-\frac{7}{x}\right)$
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