1.

If alpha and beta are two points on the hyperbola x^(2)/a^(2)-y^(2)/b^(2)=1 and the chord joining these two points passes through the focus (ae, 0) then e cos ""(alpha-beta)/(2)=

Answer»

`COS ""(alpha+beta)/(2)`
`cos""(alpha-beta)/(2)`
`cos""(2alpha+2beta)/(4)`
`cos""(alpha+beta)/(4)`

ANSWER :A


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