$x^4-6x^2$
$11+2x+x+4$
$0.9867-0.995$
$\lim_{x\to-2}\left(\frac{\sqrt{5+x}-\sqrt{5}}{x}\right)$
$4x^2-24x-20=8$
$2x^2-4x-5>1$
$15\cdot4.2$
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