$x\left(\frac{dy}{dx}\right)+y=x^2y^4$
$\int4\arccsc\left(x\right)dx$
$2x^2+7x-3=0$
$2x^2\:+\:2x\:+\:xy\:=\:5\:$
$\left(x^2-x\right)\left(x^2+x\right)-\left(x^2-1\right)^2$
$x^2-12x+27=0$
$2x^2-4x-1$
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