The angle between the vectors \[\mathbf{i}-\mathbf{j}+\mathbf{k}\] and \[\mathbf{i}+2\mathbf{j}+\mathbf{k}\] is [BIT Ranchi 1991]

\[{{\cos }^{-1}}\left( \frac{1}{\sqrt{15}} \right)\]

\[{{\cos }^{-1}}\left( \frac{4}{\sqrt{15}} \right)\]

\[{{\cos }^{-1}}\left( \frac{4}{15} \right)\]

The angle between the vectors \[\mathbf{i}-\mathbf{j}+\mathbf{k}\] and

1.	The angle between the vectors \[\mathbf{i}-\mathbf{j}+\mathbf{k}\] and \[\mathbf{i}+2\mathbf{j}+\mathbf{k}\] is [BIT Ranchi 1991]
A.	\[{{\cos }^{-1}}\left( \frac{1}{\sqrt{15}} \right)\]
B.	\[{{\cos }^{-1}}\left( \frac{4}{\sqrt{15}} \right)\]
C.	\[{{\cos }^{-1}}\left( \frac{4}{15} \right)\]
D.	\[\frac{\pi }{2}\]
Answer» E.

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The angle between the vectors \[\mathbf{i}-\mathbf{j}+\mathbf{k}\] and \[\mathbf{i}+2\mathbf{j}+\mathbf{k}\] is [BIT Ranchi 1991]

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