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Mathematics
For a matrix A , AI = A and AA T = I is true for
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Q. For a matrix $A , AI = A$ and $AA ^{ T }= I$ is true for
Matrices
A
If $A$ is a square matrix
B
If $A$ is a non singular matrix
C
If $A$ is symmetric matrix
D
If $A$ is any matrix
Solution:
It is obvious.