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Question 77

If $$A = \begin{bmatrix} 1 & \sin\theta & 1 \\ -\sin\theta & 1 & \sin\theta \\ -1 & -\sin\theta & 1 \end{bmatrix}$$, then for all $$\theta \in \left(\frac{3\pi}{4}, \frac{5\pi}{4}\right)$$, det(A) lies in the interval:

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