$\lim_{x\to b}\left(\frac{x^4+b^4}{x^2+b^2}\right)$
$\frac{d}{dx}5.2x$
$\left(\frac{2}{5}x+5\right)\left(\frac{1}{5}x+1\right)$
$b^2-2b+1$
$\frac{1}{3}\sec^3\:2t-\sec2t$
$7\sqrt[5]{n^2}+2n^{\frac{2}{5}}$
$\int\frac{\left(2x+18\right)}{x\left(x^2+19\right)}dx$
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