$\tan^{-1}\left(\frac{-3}{-3}\right)$
$y^2\frac{dy}{dx}=\frac{y+1}{yx}$
$\frac{2}{x-4}<1$
$\int a^3e^ada$
$\lim_{x\to4}\:\sqrt{2x^2-6x-8}$
$-1a+9a$
$\left(4m^5-5n^6\right)^2$
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