$\int lnt^2dt$
$\frac{d}{dx}lnx-2lny+5xy=3$
$\frac{\tan\:\left(120\right)+\tan\:\left(-150\right)}{1-\tan\:\left(120\right)\tan\:\left(-150\right)}$
$\frac{x^2-7x+9}{x+1}$
$\int\:\left(9x-7\right)^8dx$
$\left(3a-4\right)\left(3a+6\right)$
$3\frac{dy}{dx}+12y=3e^{2x}$
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