$\lim_{h\to0}\left(\frac{\sqrt{h+2-\sqrt{2}}}{h}\right)$
$-6\cdot3^{-4}$
$\lim_{x\to\infty}\left(\frac{-x}{e^{-x}}\right)$
$x-3=3$
$4m^2-9$
$18x^2+7x^2$
$36t^2-24t+4$
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