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If a,b,c are three mutally perpendicular...

If a,b,c are three mutally perpendicular vectors such that |a| = |b| = |c| then find the angle between vector a and (a + b + c) =

A

`pi//3`

B

`cos^(-1) (1//3)`

C

`cos^(-1) (1//sqrt(3))`

D

`cos^(-1) (2//3)`

Text Solution

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The correct Answer is:
C
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