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$\lim_{x\to4}\left(\frac{\sqrt{x}-\sqrt{2}}{x-2}\right)$
$\sqrt{1+\frac{y}{81-y^2}}$
$5x-8<4+2x$
$\left(x\:+4y\right)^2$
$y'=3x+5$
$14-4\left(x+12\right)<4+x$
$\frac{tan^2x-sin^2x}{1-cos^2x}$
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