$2x^2+22+81$
$\lim_{x\to0}\left(arctan8t\right)$
$19\cdot y=152$
$3x^2-18x+12=0$
$\int\:\frac{1}{\sqrt{1-x^2}}dx$
$9t^2-2t$
$80-\left(50-20\right):5$
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