$3x^23$
$\lim_{x\to0}\left(-\frac{2ln\left(x\right)}{x-e^{-x}}\right)$
$\frac{dy}{dx}=\left(1+x^2\right)^4$
$\frac{dy}{dx}=\frac{-2x-cosx}{3y^2+4y}$
$\int\frac{2w-2w^3}{w^4-2w^2}dw$
$x-3<7$
$\lim_{x\to-\infty}\left(\frac{\sqrt[3]{x+2}}{\left(x+1\right)}\right)$
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