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Let alpha, beta be the roots of the equa...

Let `alpha, beta` be the roots of the equation `x^2-(2a+1)x+a=0` and `gamma, delta` be the roots of the equation `x^2+(a-4)x+a-1=0`. If `alpha/gamma-delta/beta=(alphadelta(alpha-gamma+beta-delta))/a` then the value of `(a-1)^(-2) ` is

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