$2z\left(2z-k\right)^2$
$\int x\left(\frac{x^3}{4}+\frac{4}{x^2}\right)dx$
$\left(\frac{18a^2bc^3}{2ac^5}\right)$
$\sec y-\tan y=\frac{\cos y}{1+\sin y}$
$-2m^3n^2-15m^3n^2\:$
$2\sqrt{5}+7\sqrt{5}-4\sqrt{5}$
$\sqrt[4]{a^{16}}$
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