$x^2+21x+110$
$\lim_{x\to\infty}\left(\frac{\sqrt{3x^4+5x^2}}{x^2-1}\right)$
$10x-7=x+20$
$2x<-6$
$7 x ^ { 4 } y + 5 x ^ { 2 } y + 10 x$
$12x^2-3x+4$
$\int_x^{x^2}\left(\frac{2}{\left(1+a^2\right)^2}\right)da$
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