If \( \theta \) and \( \phi \) are the eccentric angles of a focal ...

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If \( \theta \) and \( \phi \) are the eccentric angles of a focal chord
P of the ellipse \( \frac{x^{2}}{a^{2}}+\frac{y^{2}}{b^{2}}=1 \), then the value of

W \( \tan \frac{\theta}{2} \tan \frac{\phi}{2} \) is equal to
(1) \( \frac{1-e}{1+e} \)
(2) \( \frac{e-1}{e+1} \)
(3) \( \frac{e+1}{e-1} \)
(4) \( \frac{e-1}{e+3} \)
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