The eccentricity of the ellipse of minor-axis $2 b$, if the line segment joining the foci subtend an angle…

The eccentricity of the ellipse of minor-axis $2 b$, if the line segment joining the foci subtend an angle $2 \alpha$ at the upper vertex is equal to
  1. $\cos \alpha$
  2. $\sin \alpha$
  3. $\tan \alpha$
  4. $\sec \alpha$

Solution

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Asked in: AP EAMCET 2020 (07 Oct Special)

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