The tangent and normal to \( x^{2}+4 y^{2}=4 \) at \( P(\theta) \) ...

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The tangent and normal to \( x^{2}+4 y^{2}=4 \) at \( P(\theta) \) meet
\( \mathrm{P}^{10: 4} \) the major axis in \( Q \) and \( R \) and \( Q R=2 \), then \( \cos \theta \) is

WV
(1) \( \frac{2}{3} \)
(2) \( \frac{1}{3} \)
(3) \( \frac{1}{2} \)
(4) \( \frac{1}{6} \)
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