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[" Example "27" If "A" and "B" are symme...

[" Example "27" If "A" and "B" are symmetric matrices of the same order,then show that "AB],[" is symmetric if and only if "A" and "B" commute,that is "AB=BA.],[" Solution since "A" and "B" are both symmetric matrices,therefore "A'=A" and "B'=B" ."]

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