$-31\left(-56\right)-6$
$y''+36y\:=0$
$\frac{x^{2}}{9}\cdot\frac{3}{x}$
$\lim_{x\to2}\left(\frac{3-x}{\left(x-2\right)^2}\right)$
$\left(1+\tan\:^{\left(2\right)}x\right)\left(\cos\:\:x\right)=sec\left(x\right)$
$xy'=y^2-y$
$4a+3+10-9a$
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