Giải hệ phương trình: $\left\{\begin{matrix} x=cos\left ( \frac{\Pi }{3\sqrt{3}}y \right ) & & & \\ y=cos\left ( \frac{\Pi }{3\sqrt{3}}z \right ) & & & \\ z=cos\left ( \frac{\Pi }{3\sqrt{3}}x \right ) & & & \end{matrix}\right.$
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