The angle between the vectors \[(2\mathbf{i}+6\mathbf{j}+3\mathbf{k})\] and \[(12\mathbf{i}-4\mathbf{j}+3\mathbf{k})\] is [MP PET 1996]

\[{{\cos }^{-1}}\left( \frac{1}{9} \right)\]

\[{{\cos }^{-1}}\left( \frac{1}{10} \right)\]

\[{{\cos }^{-1}}\left( \frac{9}{11} \right)\]

\[{{\cos }^{-1}}\left( \frac{9}{91} \right)\]

The angle between the vectors \[(2\mathbf{i}+6\mathbf{j}+3\mathbf{k})\

1.	The angle between the vectors \[(2\mathbf{i}+6\mathbf{j}+3\mathbf{k})\] and \[(12\mathbf{i}-4\mathbf{j}+3\mathbf{k})\] is [MP PET 1996]
A.	\[{{\cos }^{-1}}\left( \frac{1}{10} \right)\]
B.	\[{{\cos }^{-1}}\left( \frac{9}{11} \right)\]
C.	\[{{\cos }^{-1}}\left( \frac{9}{91} \right)\]
D.	\[{{\cos }^{-1}}\left( \frac{1}{9} \right)\]
Answer» D. \[{{\cos }^{-1}}\left( \frac{1}{9} \right)\]

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The angle between the vectors \[(2\mathbf{i}+6\mathbf{j}+3\mathbf{k})\] and \[(12\mathbf{i}-4\mathbf{j}+3\mathbf{k})\] is [MP PET 1996]

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