$\lim_{x\to3}\left(\frac{x^2-6x+9}{x^4-81}\right)$
$x^2+y^2=d^2$
$\sqrt{\frac{5x^2}{6}}$
$25-40m^2+16m^4$
$-576+5$
$\int e^{-\left(s-a\right)t}dt$
$7x^{2}+5x+12-7x^{2}+5^{x}+10$
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