$x+7=21$
$\left(64s^3-27\right)$
$\lim_{x\to16}\left(\frac{x+2}{\sqrt{x}-4}\right)$
$\sec^2\left(a\right)\csc^2\left(a\right)=\sec^2\left(a\right)+\csc^2\left(a\right)$
$4x-7\le x-2$
$\int\:\frac{x^2+2x}{x^2+2x+1}dx$
$xdx=x^2dv$
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