$\lim_{x\to-2}\sqrt{5x^2+10x-2}$
$\left(12a^3b^5+3a^4\right)\left(12a^3b^5-5a^4\right)$
$\lim_{x\to3}\left(x^2+x+\sqrt{x+1}\right)$
$-4\cdot0.5$
$\sqrt{5+m}=1$
$6x^2+2x-18$
$\lim_{x\to2}\left(x^2-4x+6\right)$
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