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The resultant of \( \vec{P} \) and \( \vec{Q} \) is perpendicular to \( \vec{P} \).
\( \mathrm{P} \)
What is the angle between \( \vec{P} \) and \( \vec{Q} \) ?
W
(A) \( \cos ^{-1}\left(\frac{P}{Q}\right) \)
(B) \( \cos ^{-1}\left(\frac{-P}{Q}\right) \)
(C) \( \sin ^{-1}\left(\frac{P}{Q}\right) \)
(D) \( \sin ^{-1}\left(\frac{-P}{Q}\right) \)
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