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Two vertices of an equilateral triangle are \( (-1,0) \) and \( (1,0) \) and its third vertex lies above the \( x \)-axis. The equation of its circumcircle, is
(A) \( x^{2}+y^{2}-\frac{1}{\sqrt{3}} y-1=0 \)
(B) \( x^{2}+y^{2}+\frac{2}{\sqrt{3}} y-1=0 \)
(C) \( x^{2}+y^{2}-\frac{2}{\sqrt{3}} y-1=0 \)
(D) none of these
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