$\frac{144x^2-1}{12x^2-1}$
$+6+2\cdot\left(+7-5\right)$
$\left(y^2-4\right)\left(y^2-3\right)$
$2xy+7x^2y-xy^2$
$a^2+2a^2$
$\lim_{x\to12}\left(\frac{144-x^2}{12x-x^2}\right)$
$\int_{0.4}^1ln\left(\frac{1-x}{0.6}\right)dx$
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