defence exam Agniveer Army Technical Mock Test Series 2025 Mathematics Determinants Evaluation of Determinants

If A = \(\begin{bmatrix} \cos \theta & \sin \theta\\ \sin\theta & \cos \theta \end{bmatrix}\) then |A| =?

1
sin 2θ 
2
cos 2θ 
3
cos2 θ
4
1
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