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If alpha and beta are the eccentric angl...

If `alpha` and `beta` are the eccentric angles of the ends of a focal chord of the ellipse then `cos^(2)((alpha+beta)/(2))sec^(2)((alpha-beta)/(2))`=

A

`(a^(2)+b^(2))/(a^(2))`

B

`(a^(2)-b^(2))/(a^(2))`

C

`(a^(2))/(a^(2)+b^(2))`

D

`(a^(2))/(a^(2)-b^(2))`

Text Solution

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The correct Answer is:
D
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  13. If the chord joining two points whose eccentric angles are alpha and ...

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  14. If alpha and beta are the eccentric angles of the ends of a focal chor...

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