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For alpha, beta, gamma in R, let A=[...

For `alpha, beta, gamma in R`, let `A=[[alpha^2, 6, 8],[ 3, beta^2, 9], [4, 5, gamma^2]]` and `B=[[2, alpha, 3, 5], [ 2, 2, beta, 6], [ 1 , 4, 2 gamma, -3]]`. If trace `A=trace B`, then the value of `(alpha^-1+beta^-1+gamma^-1)` is equal to

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