$\lim_{x\to0}\left(\frac{x}{2x+\sqrt{x}}\right)$
$15x^4-11x^2$
$\left(260-x\right)^2$
$144x^2+72x+9$
$\sqrt{a^2}b^3$
$\frac{121x^4-64y^8}{11x^2+8y^4}$
$\frac{32n^2-54m^2+12mn}{8m\:-9m}$
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