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\( \mathrm{P} \)
The angle between vector \( (\vec{A}) \) and \( (\vec{A}-\vec{B}) \) is :
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[JEE Main-2021 (August)]
(a) \( \tan ^{-1}\left(\frac{-\frac{B}{2}}{A-B \frac{\sqrt{3}}{2}}\right) \)
(b) \( \tan ^{-1}\left(\frac{A}{0.7 B}\right) \)
(c) \( \tan ^{-1}\left(\frac{\sqrt{3} B}{2 A-B}\right) \)
(d) \( \tan ^{-1}\left(\frac{B \cos \theta}{A-B \sin \theta}\right) \)
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