$40x-6x^2$
$4xy-2y^2=0$
$\left(x^2+7x-5\right)\cos\left(2x\right)$
$\cot\left(x\right)dy-\left(1+y^2\right)dx=0$
$\frac{2}{9}+\frac{14}{18}$
$x^2-y^2=1$
$\sqrt{x^2-36}=8$
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