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If S,S' be the foci of an ellipse and ...

If S,S' be the foci of an ellipse and p be any point on it show that `tan(1/2)anglePSS'xxtan(1/2)anglePS'S=(1-e)/(1+e)`

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The correct Answer is:
`"tan"(alpha)/(2) "tan"(beta)/(2)=(1-e)/(1+e)`
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