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Find Is Symmetric matrix [[1,2,3],[2,5,6],[3,6,9]]

Solution:
Your problem -> Is Symmetric matrix [[1,2,3],[2,5,6],[3,6,9]]

A square matrix A=[a_(ij)] is said to be a symmetric if A = A^T i.e. a_(ij) = a_(ji) for all i,j.

A =
 1 2 3 2 5 6 3 6 9

A^T =
 1 2 3 2 5 6 3 6 9
T
=
 1 2 3 2 5 6 3 6 9

Here, A and A^T are equal, so A is a symmetric matrix

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