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A={:[(1,4,9),(-1,2,0),(3,1,9)]:}. Repres...

`A={:[(1,4,9),(-1,2,0),(3,1,9)]:}`. Represent A as sum of symmetric and skew symmetric matrix

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`{:[(1,(3)/(2),6),((3)/(2),2,(1)/(2)),(6,(1)/(2),9)]:}+{:[(0,(5)/(2),3),(-(5)/(2),0,-(1)/(2)),(-3,(1)/(2),0)]:}`
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