$\lim_{x\to info}\frac{2x^2}{5x^2+x}$
$\frac{2\left(-5\right)-7\left(3-5+2\right)-2\left(3^2-1\right)}{3-2\left(5-7\right)-5}$
$-2x+2x\:-\:1$
$\left(n+1\right)^k.\frac{k}{n+1}$
$cos2x-4sinx=1$
$\frac{x^3-5x^2+3x^2-2}{x+1}$
$x\:+\:2y\:-z\:=\:-5$
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