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[v,d]=eig(A)
v =

    0.4082    0.7071    0.5774
    0.4082   -0.7071    0.5774
   -0.8165         0    0.5774


d =

   -0.0000         0         0
         0         0         0
         0         0    3.0000
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v =

  -0.30359170788244  -0.75795695232097   0.57735026918963
  -0.50461412174377   0.64189660756498   0.57735026918963
   0.80820582962621   0.11606034475599   0.57735026918963


d =

  -0.00000000000000                  0                  0
                  0  -0.00000000000000                  0
                  0                  0   3.00000000000000

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