$2xydy=\left(x^2+y^2\right)dx$
$\lim_{x\to2}-\left(\frac{|x|-2}{x-2}\right)$
$-9x^2+x+5x^5$
$-\left(-5+7\right)$
$x+\left(-5\right)+1$
$4^2x-8^2+12x$
$\lim_{x\to+\infty}\frac{2\sqrt{x}}{\sqrt{x}-1}$
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