$\frac{\sec^2a-1}{\tan a\:}=\tan a$
$12x^3+12x^2$
$\frac{3}{5}m-\frac{3}{6}m+\frac{4}{5}m^2-\frac{1}{5}m+\frac{3}{2}m^2$
$\left(-7\right)\:\left(-9\:\right)\left(-3\right)$
$4x^2+7x-4+x^2-6x^4+5$
$\frac{\left(-1\right)^nx^n}{5^n}$
$t\sqrt{2t^2+16}$
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