$\lim_{x\to\infty}\frac{1+7^n}{4^n}$
$\int\frac{\left(9e^x+6e^{-x}\right)}{\left(9e^x-6e^{-x}\right)}dx$
$\int\frac{x}{5+x^4}dx$
$\frac{d}{dx}\left(e^{7xy}=9y\right)$
$\frac{4a^2b^5}{64^3b^3}$
$x+9+2x-2x-3$
$\sqrt[1]{-3}$
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