$\left(x-1\right)\left(y'\right)'=y$
$\int\frac{\left(-20\right)}{x^2\sqrt{4+x^2}}dx$
$x3+2x+4;\:x=3$
$\lim_{x\to\infty}\left(\frac{\sqrt{9x+1}}{x+4}\right)$
$6^2-4$
$\frac{-12000}{-5}$
$9-6w+5$
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