$\lim_{x\to\infty}\left(\frac{-x-e^{15x}}{2x^2-2x-18}\right)$
$x+3>0$
$4x^2-15x-36$
$\frac{2^{x^2+1}}{4^{x-1}}=16$
$\frac{dy}{dx}\left(\sqrt{2x+y}=2x^3\right)$
$\left(2k+5\right)\left(2k-2\right)$
$\int\left(\frac{\left(\sqrt{1+x^2}\right)}{x^2}\right)dx$
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