$\left(-12-9\right)-\left(-3-4\right)-\left(15\right)$
$\lim_{x\to0}\left(\frac{1}{2}\right)^x$
$\int x\left(x^4+3\right)^2dx$
$\frac{4x^2y}{12xy^5}$
$\lim_{x\to0}\left(x\pi\right)$
$\left(3m^2+8n^4\right)^2$
$\int\frac{x+1}{\left(x^2+2\right)^2}dx$
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