$xydx=\left(1-x^2\right)dy$
$-x-4x+17-12-x$
$\sin\left(\frac{\pi}{2}\right)+a-\cot\left(\frac{\pi}{2}\right)+a-\cos\left(a\right)$
$x-2y+6=0$
$\left(20-4\right)\left(5-2+3\right)\left(1\right)$
$\int\left(z^4\ln\left(z\right)\right)dx$
$x^2+y^2-4x^2-3xy-y^2$
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