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The matrix  is a 

  1. identity matrix
  2. symmetric matrix
  3. skew symmetric matrix
  4. none of these

Answer (Detailed Solution Below)

Option 2 : symmetric matrix
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Detailed Solution

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Concept:

A square matrix A = [aij]n × n is said to be symmetric if AT = A

AT (Transpose) is obtained by changing rows to columns and columns to rows

Calculation:

Let A = 

 AT =  = A

 A is  a symmetric matrix

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