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Let `ABC` be a triangle such that `angleABC=pi/6` and let `a, b and c` denote the lengths of the sides opposite to `A, B and C` respectively. The value(s) of x for which `a=x^2+x+1,b=x^2-1 and c=2x+1` is / are (a) `-(2+sqrt3)` (b) `1+sqrt3` (c) `2+sqrt3` (d) `4qsrt3`

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