$\int - 13 d x$
$\left(x+ye^{xy}\right)dx+\left(4+xe^{xy}\right)dy=0$
$\frac{2-\sqrt{4}}{4-4}$
$-4a^2+3a^2$
$32a^2b-162b^5$
$9+6-\left(-10\right)$
$\csc^{2}\theta\cdot\tan^{2}\theta-1=\tan^{2}\theta$
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