Teaching AWES Army Public School TGT Mock Test 2024 Mathematics Determinants Evaluation of Determinants
If A, B and C are angles of a triangle, then the determinant \(\left|\begin{array}{ccc}−1 & \cos \rm C & \cos \rm B \\ \cos \rm C & −1 & \cos \rm A \\ \cos \rm B & \cos \rm A & −1\end{array}\right|\) is equal to
1
0
2
−1
3
1
4
None of these