$3\:.\:\sqrt{81+19}+7$
$\frac{dv}{dt}=v+t$
$1=ae^{-x+1}$
$2x+3y-5x-9y+8xy-2x$
$\lim_{x\to\infty}\left(\frac{x-1}{x^2+1}\right)^{x+1}$
$\sqrt{16}-2^2$
$\left|\left(+16\right)-\left(-25\right)\right|$
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