Express the matrix A as the sum of a sym...

Express the matrix A as the sum of a symmetric matrix and a skew-symmetric matrix, where
`A=[(2,4,-6),(7,3,5),(1,-2,4)]`

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The correct Answer is:

`[(2,11//2,-5//2),(11//2, 3, 3//2),(-5//2,3//2,4)]+[(0,-3//2,-7//2),(3//2,0,7//2),(7//2,-7//2,0)]`

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