Question
If $\text{A} = \begin{bmatrix} \\cos\theta & \sin\theta & \\ -\sin\theta & \cos\theta & \\ \end{bmatrix}, $ then for any natural number n, find the value of Det $(A^{n}).$

Answer

getting $|\text{A}| = 1$
$|\text{A}^{\text{n}}| = 1$

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