If \( \left[\begin{array}{cc}\cos \frac{2 \pi}{7} & -\sin \frac{2 \pi}{7} \\ \sin \frac{2 \pi}{7....

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If \( \left[\begin{array}{cc}\cos \frac{2 \pi}{7} & -\sin \frac{2 \pi}{7} \\ \sin \frac{2 \pi}{7} & \cos \frac{2 \pi}{7}\end{array}\right]^{k}=\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right] \), then the least
\( \mathrm{P} \)
positive integral value of \( k \) is
(1) 3
(2) 6
(3) 7
(4) 14


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