$10+8x-2x^2$
$\frac{6ab}{\left(a^0b^2\right)^4}$
$\lim_{x\to1}\frac{\sqrt{x^2+6x-1}-\sqrt{x^3+6x-1}}{x-1}$
$4\cos^2e+2\cos e=0$
$-4u+17=1$
$\frac{\left(\sqrt{18}x-78\right)}{8}^2$
$series\:$
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