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$A =\left[\begin{array}{cc}\cos \frac{2 \pi}{3} & -\sin \frac{2 \pi}{3} \\ \sin \frac{2 \pi}{3} & \cos \frac{2 \pi}{3}\end{array}\right]$ તો $A ^3=\ldots \ldots \ldots \ldots$

• A
  $\left[\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right]$
• ✓
  $\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
• C
  $\left[\begin{array}{ll}1 & 1 \\ 0 & 0\end{array}\right]$
• D
  $\left[\begin{array}{ll}0 & 0 \\ 1 & 1\end{array}\right]$