$\lim_{x\to0}\left(\frac{x-2}{\sqrt{2x-2}}\right)$
$\left(z\cdot z^2\right)$
$\frac{a^{-2}}{a^{-6}}$
$\sec\left(u\right)\cos\left(u\right)-\sin^2\left(u\right)=\cos^2\left(u\right)$
$\left(3x-4b\right)^3$
$2\left(x+1\right)^2-3$
$\frac{3x}{2}=12$
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