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ISI2016-PCB-A-1

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If $\alpha, \beta, \gamma$ are the roots of the equation $x^3+6x+1=0$, then prove that $$\frac{\alpha}{\beta} + \frac{\beta}{\alpha} + \frac{\beta}{\gamma}+ \frac{\gamma}{\beta} + \frac{\gamma}{\alpha}+ \frac{\alpha}{\gamma}=-3.$$
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