$w^2-81$
$sec^2\left(\theta\:\right)+tan^2\left(\theta\:\right)cos^2\left(\theta\:\right)+cos^2\left(\theta\:\right)$
$\left(13-2y\right)\left(10-2y\right)$
$4a^3b+20a^2b^2+25ab^3$
$3\left\{x^2-5\left[x+2\left(3-5x\right)\right]\right\}$
$\tan^2x+21=\sec^2x+20$
$\:\left(\sqrt{x}\right)^{5x}$
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