If the normal at the point \( P(\theta) \) to the ellipse \( \frac{...

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If the normal at the point \( P(\theta) \) to the ellipse \( \frac{x^{2}}{14}+\frac{y^{2}}{5}=1 \), intersects it again at the point \( Q(2 \theta) \),
\( \mathrm{P} \) show that \( \cos \theta=-(2 / 3) \).

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