$e^2\infty$
$-5.4+9$
$a^3-4a^2+6a-4$
$\lim_{x\to-2}\left(\frac{x+2}{\sqrt{x+3}-1}\right)$
$\int x\left(\sqrt[3]{x}-\frac{1}{\sqrt[3]{x}}\right)^3dx$
$\frac{dy}{dx}=\frac{1-e^{-2x}}{e^x-e^{-x}}$
$\frac{dx}{dy}=\frac{2x-xy}{1-x^2}$
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