If \( C D \) is a diameter of an ellipse \( x^{2}+9 y^{2}=25 \) and...

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If \( C D \) is a diameter of an ellipse \( x^{2}+9 y^{2}=25 \) and
\( \mathrm{P}^{17} \)
W the eccentric angle of \( C \) is \( \frac{\pi}{6} \), then the eccentric angle of \( D \) is
(1) \( \frac{5 \pi}{6} \)
(2) \( -\frac{5 \pi}{6} \)
(3) \( -\frac{2 \pi}{3} \)
(4) \( \frac{2 \pi}{3} \)
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