The angle between the vectors a + b and a ? b, when \[\mathbf{a}=(1,\,1,\,4)\] and \[b=(1,\,-1,\,4)\] is [Karnataka CET 2003]

The angle between the vectors a + b and a ? b, when \[\mathbf{a}=(1,\,

1.	The angle between the vectors a + b and a ? b, when \[\mathbf{a}=(1,\,1,\,4)\] and \[b=(1,\,-1,\,4)\] is [Karnataka CET 2003]
A.	\[{{90}^{o}}\]
B.	\[{{45}^{o}}\]
C.	\[{{30}^{o}}\]
D.	\[{{15}^{o}}\]
Answer» B. \[{{45}^{o}}\]

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The angle between the vectors a + b and a ? b, when \[\mathbf{a}=(1,\,1,\,4)\] and \[b=(1,\,-1,\,4)\] is [Karnataka CET 2003]

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