$\lim_{x\to-4}\left(\frac{x^2-16}{4x+16}\right)$
$\frac{d}{dx}\left(\sqrt{\frac{x+1}{x^3+1}}\right)$
$2x^2+28x+98$
$x^2y'=y^2-x^2y^2$
$\frac{16x^8-1}{2x^2-1}$
$81x^2-18x+1$
$\frac{4}{x^2-x-6}$
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