$2xy\:dx\:+\:\left(x^2+\cos\left(y\right)\right)dy=0$
$-\cos\left(\frac{x}{4}\right)^2$
$5a\left(13+a\right)-c\left(a+13\right)$
$4^{10}\:.\:16^2$
$x+7<5$
$\left(x+y+1\right)dx+\left(x-y-3\right)dy=0$
$-8x+4<5x+12$
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