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If A=[[0,a,b],[-a,0,c],[-b,-c,0]] find (...

If `A=[[0,a,b],[-a,0,c],[-b,-c,0]]` find `(1)/(2)(A+A')` and `(1)/(2)(A-A')`

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The correct Answer is:
`[(0,0,0),(0,0,0),(0,0,0)],[(0,a,b),(-a,0,c),(-b,-c,0)]`
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