Value of roots

Algebra Level 3

If \( \alpha , \beta \) be the roots of \( x^{2} -a(x - 1) + b = 0 \), then the value of \( \frac{1}{ (\alpha)^{2} - a\alpha } + \frac{1}{ (\beta)^{2} - a\beta } + \frac{2}{a + b} \) is

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