The angle between the vector \[2i+3j+k\] and \[2i-j-k\] is [MNR 1990; UPSEAT 2000]

The angle between the vector \[2i+3j+k\] and \[2i-j-k\] is

1.	The angle between the vector \[2i+3j+k\] and \[2i-j-k\] is [MNR 1990; UPSEAT 2000]
A.	\[\pi /2\]
B.	\[\pi /4\]
C.	\[\pi /3\]
D.	0
Answer» B. \[\pi /4\]

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The angle between the vector \[2i+3j+k\] and \[2i-j-k\] is [MNR 1990; UPSEAT 2000]

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