$\lim_{w\to0}\left(\frac{a\sqrt{w^2+a^2\:}}{b\sqrt{w^2+b^2}}\right)$
$5^3\cdot5^5$
$x^2+24x+145$
$15x^2-20x-20=0$
$\frac{x^2-4x-12}{x-6}$
$\frac{\left(x^2-4x+4\right)}{x^2-4}$
$3\left(8c-6\right)+2\left(-2c+5\right)$
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