1.

If alpha,beta are the ends of a focal chord of the ellipse (x^(2))/(a^(2))+(y^(2))/(b^(2))=1then its eccentricity e is

Answer»

`(1+TAN(ALPHA)/(2)tan(BETA)/(2))/(1-tan (alpha)/(2)tan (beta)/(2))`
`(1-tan(alpha)/(2)tan(beta)/(2))/(1+tan (alpha)/(2)tan (beta)/(2))`
`(tan(alpha)/(2)tan(beta)/(2)+1)/(tan(alpha)/(2)tan (beta)/(2)-1)`
`(tan(alpha)/(2)tan(beta)/(2)-1)/(tan (alpha)/(2)tan (beta)/(2)+1)`

ANSWER :A


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