If alpha,beta, gamma re the roots of the...

If `alpha,beta, gamma` re the roots of the equations` x^3+px^2+2x+p=0` then the general value of `tan^-1 alpha+tan^-1 beta+tan^-1 gamma` is (A) `npi` (B) `(npi)/2` (C) `(2n+1) pi/2` (D) dependent upon the value of p.

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