$x^2\frac{dy}{dx}=7x^4+14xy$
$\left(2y+2\right)\left(2y-4\right)$
$\sqrt{18}\cdot\sqrt{50}\cdot\sqrt{98}$
$\lim_{x\to-\infty}\left(\frac{\sqrt{x^2-2x+3}}{x+4}\right)$
$\csc x-1=0$
$\frac{d^3}{d^3}$
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