$d\pi^{-1}$
$-100-\left(-20\right)$
$\lim_{x\to\infty}\left(e^x+x\right)^{\frac{1}{2}}$
$\left(x^2+7\right)\left(x^2-2\right)$
$\sqrt{89x^2}$
$\frac{2xyz}{\left(x^2+xz+xy+yz\right)\left(y+z\right)}$
$\lim_{x\to\infty}30-5x$
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