defence exam ITBP (Telecommunication) Head Constable Mock Test 2024 Mathematics Matrices Transpose of a Matrix
If \({\rm{A}} = \left[ {\begin{array}{*{20}{c}} {\cos {\rm{\alpha }}}&{\sin {\rm{\alpha }}}\\ { - \sin {\rm{\alpha }}}&{\cos {\rm{\alpha }}} \end{array}} \right]\) then what is AAT equal to (where AT is the transpose of A)?
1
Null matrix
2
Identity matrix
3
A
4
-A