$x^5-16x^3-202+81$
$x\:\lim_{x\to\:-3}\frac{\sqrt{4x+28}-4}{x+3}\:$
$10x^2-8x-2$
$4n^2-16$
$-\frac{1}{2}e^{-x}\left(\sin\left(x\right)+\cos\left(x\right)\right)$
$\sec x+\cos^2x$
$\left(x^4\:+\:y^4\right)dx\:-\:xy^3\:dy\:=\:0$
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