$\lim_{x\to\infty}\left(9\sqrt{x^2+6x}-9x\right)$
$4\left(2x-3\right)$
$x\frac{dy}{dx}+y=ln\left(x\right)$
$\left(x^2-2\right)\left(x^2+2x-3\right)$
$2x+3\ge-9$
$\frac{dy}{dx}=2y\tanh\left(x\right)$
$7\left(p+6\right)$
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