1.

If vectors P, Q and R have magnitude 5, 12 and 13 units and \[\overrightarrow{P}+\overrightarrow{Q}=\overrightarrow{R},\] the angle between Q and R is [CEET 1998]

A.        \[{{\cos }^{-1}}\frac{5}{12}\]
B.      \[{{\cos }^{-1}}\frac{5}{13}\]
C.        \[{{\cos }^{-1}}\frac{12}{13}\]    
D.        \[{{\cos }^{-1}}\frac{7}{13}\]
Answer» D.        \[{{\cos }^{-1}}\frac{7}{13}\]


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