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If 0102 are the eccentric angles of the ...

If `0_1``0_2` are the eccentric angles of the extremeties of a focal chord (other that the verticles) of the ellipse `x^2/a^2+y^2/b^2=1` `(agtb` and e its its eccentricity. Then show that
`(e+1)/(e-1)=cot(0_1/2).cot(0_2/2)`.

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