$\frac{d}{dx}\left(x^2+xy^3+y^2=3\right)$
$n^2-18n$
$\left(mr-7t\right)\left(mr+2t\right)$
$\sin\:\left(x+y\right)+\cos\:\left(x+y\right)$
$\frac{cos\left(x\right)}{cos\left(x\right)}$
$\sin\left(b\right)\left(1-\cot^2\left(b\right)\right)$
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