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If $$\alpha, \beta, \gamma$$ are the roots of equations $$X^3 + Px^2 + qx + p = 0$$, Then the value of $$\tan^{-1} \alpha + \tan^{-1} \beta + \tan^{-1} \gamma$$ is
$$\frac {n \pi}{2}$$
$$n \pi$$
$$2 n \pi$$
$$\frac{n \pi}{4}$$
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