$\frac{1}{x^2-1\cdot\:1^2}$
$x^3-3x^2-4x$
$\frac{\sqrt{w}}{\sqrt{w+3}-\sqrt{3}}$
$\lim_{x\to\infty}\left(\frac{x-3}{x^2+5x+1}\right)$
$\left(x+3\right)\left(x^2-x-2\right)=0$
$36x^7m^3-18x^9m^2+48x^3m^5$
$2 x + 5 < 3 x$
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