The angles between the straight lines joining the origin to the poi...

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The angles between the straight lines joining the origin to the points common to
W \( 7 x^{2}+8 y^{2}-4 x y+2 x-4 y-8=0 \) and \( 3 x-y=2 \) is :
(A) \( \tan ^{-1} \sqrt{2} \)
(B) \( \frac{\pi}{3} \)
(C) \( \frac{\pi}{4} \)
(D) \( \frac{\pi}{2} \)
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