$\lim_{x\to a}\left(\frac{\left(x-a\right)cos\left(\pi\:a\right)}{x^2sin\left(\pi\:a\right)}\right)$
$x^21$
$\frac{dy}{dx}+5y=8$
$\frac{2}{x}+\frac{2}{x}$
$-7+6-8+8-6+9-4+9$
$a\left(x-3\right)+b\left(x-3\right)-c\left(a-3\right)$
$\left(x^6+a^7\right)\cdot\left(x^6-a^7\right)$
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