An ellipse has \( O B \) as a semi-minor axis. \( F \) and \( F^{\p... VIDEO
An ellipse has \( O B \) as a semi-minor axis. \( F \) and \( F^{\prime} \) are its foci and the angle \( F B F^{\prime} \) is a right angle. Then, the eccentricity of the ellipse is (1997, 2M)https://bit.ly/YTAI_PWAP https://www.pw.live
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