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If the matrices A=[(1,2),(3,4)] and B=[(...

If the matrices `A=[(1,2),(3,4)] and B=[(a,b),(c,d)] (a,b,cd` not all simultaneously zero) commute, find the value of `(d-b)/(a+b-c).` Also show that the matrix which commutes with A is of the form `[(alpha-beta,(2beta)/3),(beta,alpha)]`

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