$$( \frac { x ^ { a } } { x ^ { b } } ) ^ { 2 } ( \frac { x ^ { b } } { x ^ { c } } ) ^ { 2 } ( \frac { x ^ { c } } { x ^ { a } } ) ^ { 2 } = 1$$
$\left\{\begin{matrix}a=0\text{, }&b=0\text{ and }c=0\\a\in \mathrm{C}\text{, }&x\neq 0\end{matrix}\right.$
$\left\{\begin{matrix}b=0\text{, }&c=0\text{ and }a=0\\b\in \mathrm{C}\text{, }&x\neq 0\end{matrix}\right.$
