$-3\sqrt{3a^2}+9$
$\lim_{x\to\infty}\frac{2x^2+3x+1}{x^4\:-x^2}$
$55m^2n^3x+110m^2n^3-220m^3y^3$
$\lim_{x\to\infty}\sqrt{\frac{x\left(x+\sqrt{x}\right)}{x^2-x-\sqrt{x}}}$
$2m^4\cdot4m$
$cosx=sinx$
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