$\frac{d}{dx}-4y^2-9=0$
$\int2xe^{-9x^2}dx$
$\int x\sqrt{3x^2+4}dx$
$-x=-13$
$\lim_{x\to-\infty}\left(\frac{x^2+4}{\sqrt{2+x^2}}-x\right)$
$r\:log\:b+log\:c$
$\frac{d}{dx}xy+5e^y=5e$
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