$\lim_{x\to3}\left(\frac{x^2-9}{x^2+1}\right)$
$2x^2+26+9$
$\left(a+2\right)^2\left(a-3\right)\left(a+3\right)$
$\int3\ln6xdx$
$\frac{6}{\sqrt{x}-\sqrt{3}}$
$\frac{d}{dx}\ln\sin\left(3x\right)$
$\frac{dy}{dx}=\frac{4x}{y+3}$
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