Mickey Mouse?

Geometry Level 3

If \(a,b\) and \(c\) are the sides of \(\Delta ABC\) opposite to angles \(A,B\) and \(C\), and \(r_{1},r_{2}\) and \(r_{3}\) are the corresponding exradii, then find the value of \[\frac {b-c}{r_{1}} + \frac {c-a}{r_{2}} + \frac{a-b}{r_{3}}\]

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