$\frac{x^3-13x+12}{x-3}$
$x^2+2x+7$
$\lim_{x\to\infty}\left(\sin\left(6x\right)-2x\right)$
$4x^2-36xy+81y^2$
$\lim_{x\to\infty}\left(\frac{\sqrt{2+11x^2}}{2+4x}\right)$
$4w+132=180$
$4^x+6\cdot4^{-4}=5$
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