If vectors \( P, Q \) and \( R \) have magnitude 5,12 and 13 \( \ma...

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If vectors \( P, Q \) and \( R \) have magnitude 5,12 and 13
\( \mathrm{P} \) units and \( \vec{P}+\vec{Q}=\vec{R} \), the angle between \( Q \) and \( R \) is

W
(1) \( \cos ^{-1} \frac{5}{12} \)
(2) \( \cos ^{-1} \frac{5}{13} \)
(3) \( \cos ^{-1} \frac{12}{13} \)
(4) \( \cos ^{-1} \frac{7}{13} \)
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