defence exam Agniveer Army Technical Mock Test Series 2025 Mathematics Determinants Evaluation of Determinants
यदि \(\begin{bmatrix} \cos \theta & \sin \theta\\ \sin\theta & \cos \theta \end{bmatrix}\) है, तो |A| का मान क्या है?
1
sin 2θ
2
cos 2θ
3
cos2 θ
4
1