If \[\mathbf{a}=\mathbf{i}+2\mathbf{j}-3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}-\mathbf{j}+2\mathbf{k},\] then the angle between the vectors \[\mathbf{a}+\mathbf{b}\] and \[\mathbf{a}-\mathbf{b}\] is [Karnataka CET 1994; Orissa JEE 2005]

If \[\mathbf{a}=\mathbf{i}+2\mathbf{j}-3\mathbf{k}\] and \[\mathbf{b}=

1.	If \[\mathbf{a}=\mathbf{i}+2\mathbf{j}-3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}-\mathbf{j}+2\mathbf{k},\] then the angle between the vectors \[\mathbf{a}+\mathbf{b}\] and \[\mathbf{a}-\mathbf{b}\] is [Karnataka CET 1994; Orissa JEE 2005]
A.	\[{{30}^{o}}\]
B.	\[{{60}^{o}}\]
C.	\[{{90}^{o}}\]
D.	x
Answer» D. x

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If \[\mathbf{a}=\mathbf{i}+2\mathbf{j}-3\mathbf{k}\] and \[\mathbf{b}=3\mathbf{i}-\mathbf{j}+2\mathbf{k},\] then the angle between the vectors \[\mathbf{a}+\mathbf{b}\] and \[\mathbf{a}-\mathbf{b}\] is [Karnataka CET 1994; Orissa JEE 2005]

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