$\sqrt{b^2}$
$\left(r^2-6\right)\left(r^2+6\right)$
$\left(a+b\right)\:a+b$
$\frac{\left(-1\right)^n}{n\cdot3^n}\cdot\left(x+5\right)^n$
$tan^{-1}\left(tanx\right)=x$
$x^2-4x-285=0$
$-\frac{x}{65}\le\frac{1}{5}$
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