If (asectheta;btantheta) and (asecphi; b...

If `(asectheta;btantheta)` and `(asecphi; btanphi)` are the ends of the focal chord of `x^2/a^2-y^2/b^2=1` then prove that `tan(x/a)tan(phi/2)=(1-e)/(1+e)`

`(e - 1)/(e + 1)`

`(1 - e)/(1 + e) `

`(1 + e)/(1-e)`

`(e + 1)/(e - 1)`

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The correct Answer is:

b, c

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