$-\frac{5}{8}=20r^5$
$\left(3m+6\right)\left(3m-9\right)$
$50\cdot7.5$
$\frac{d}{dx}\left(2\sin\left(x^3\right)\right)$
$\frac{u^2+1}{u+1}$
$-4+6\left(9-2\right)$
$56\:-\:\left(-21\right)$
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