\( S \) and \( T \) are the foci of an ellipse and \( B \) is the end point of the minor axis. I...
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0\( S \) and \( T \) are the foci of an ellipse and \( B \) is the end point of the minor axis. If STB is equilateral triangle, the eccentricity of the ellipse is
(A) \( \frac{1}{4} \)
(B) \( \frac{1}{3} \)
(C) \( \frac{1}{2} \)
(D) \( \frac{2}{3} \)
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