Let A=[[4, a ],[-1,b]] and B=[[1,-2],[1,...

Let `A=[[4, a ],[-1,b]]` and `B=[[1,-2],[1,4]]` are two matrices satisfying the relation `A^(3)+3A^(2)B+3AB^(2)+B^(3)=(A+B)^(3)` .If `(A+B)= lambda(A^(-1)+B^(-1))` ,then find the value of `lambda`

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