$\int\frac{z}{\sqrt{9-z^2}}dz$
$-9.1-7$
$n\cdot\left(-\frac{1}{4}\right)^{-n}$
$1-20+1-198$
$y'+y\:=\:-e^x$
$\frac{dy}{dx}+y\cdot x^{-1}=3x$
$x\:x\:\sqrt{x^2+1}+x$
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