$\sqrt{81x^4b^{12}}$
$\frac{9x^4+6x^3-x^2}{3x^2}$
$\lim_{x\to-\infty}\frac{3}{x}-\frac{2x^2}{x^2+1}$
$16x^4-24x^2b+9b^2$
$x^3-x^4$
$\frac{dy}{dt}=3t^2y$
$\frac{2}{3}=\frac{x}{6}$
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