The angle between the tangents drawn from the origin to the parabol...

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The angle between the tangents drawn from the origin to the parabola \( y^{2}=4 a(x-a) \) is
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(a) \( 90^{\circ} \)
(b) \( 30^{\circ} \)
(c) \( \tan ^{-1}\left(\frac{1}{2}\right) \)
(d) \( 45^{\circ} \)
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