engineering recuitment ISRO Scientific Assistant Physics 2020 Mathematics Matrices Operations on Matrices
If \({\rm{E}}\left( {\rm{\theta }} \right) = \left[ {\begin{array}{*{20}{c}} {\cos {\rm{\theta }}}&{\sin {\rm{\theta }}}\\ { - \sin {\rm{\theta \;}}}&{\cos {\rm{\theta }}} \end{array}} \right]\) then E(α) E(β) is equal to
1
E(α β)
2
E(α - β)
3
E(α + β)
4
-E(α + β)