$\lim_{x\to\infty}\left(-3x^2+5x-7\right)$
$9x^4+12x^2y^2+4y^4$
$\int\frac{x^2-x-3}{\left(x-4\right)\left(x+5\right)^2}dx$
$-5\left(2x-1\right)$
$x+7>3$
$x\cot^22x^2$
$9x^4-11x^2+2$
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