$144m^2+144mn+36n^2$
$\frac{tan\left(x\right)+cot\left(x\right)}{tan\left(x\right)}$
$\int\left(x^2+5x+2\right)e^{2x}dx$
$\lim_{x\to3}\left(\frac{5}{x-3}-\frac{20}{x^2-x-6}\right)$
$-13xy^2\left(-6xy\right)$
$\frac{2x+3}{x+5}-\frac{x-3}{x+5}$
$\cos^2x+3\sin^2x$
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