$2xy'-y=x^3-x$
$6a+12b$
$-n^2-n^2$
$50<x-5$
$\lim_{x\to0}\left(\frac{\tan^2\left(x\right)-x^2}{x^2\tan^2\left(x\right)}\right)$
$588+807$
$-\frac{tan\left(x\right)}{sec\left(x\right)}+\frac{sec\left(x\right)}{tan\left(x\right)}=cos\left(x\right)cot\left(x\right)$
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