$9\:-\:4\:-\:4\:+\:2\:+\:5\:-\:7\:-\:6\:+\:1\:+\:3\:$
$\lim\:_{x\to\:\infty\:\:}\frac{\left(\sqrt{2x^2+x}+2x-3\right)}{\left(\sqrt{9x^2+2x+1}\right)}$
$4x^2+64$
$y'=\frac{x-y}{x+y}$
$\lim_{x\to0}\left(x^{\sqrt[4]{x}}\right)$
$x2\:-\:kx\:+\:16\:=\:0$
$\left(5x-10y\right)\left(5x-10y\right)$
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