Matrices And Determinants

$$A=\left(\begin{array}{cc}\cos \theta & -\sin \theta \\ \sin \theta & \cos \theta\end{array}\right)$$ ও \(\theta=\frac{2 \pi}{7}\) হয়, তবে \(A^{100}=A \times A \times \ldots .\). (100 বার) হবে