$\lim_{x\to\infty}\left(\sqrt{x-2}-\sqrt{x-4}\right)$
$\lim_{x\to-1}\frac{\sqrt{-2x+1}-\sqrt{3}}{x+1}$
$\lim_{x\to\infty}\left(\frac{x\:^4-2x\:^2-1}{2x^3-3x^2+3}\right)$
$\left(sinx-1\right)^2-\left(sinx+1\right)^2$
$x+3y+8+7x-2y-5$
$3\left|3-\left(3\right)\right|+\left|3\left(-5\right)-1\right|^2$
$3x-\left(7x\right)x$
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