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If `bar(a),bar(b),bar (c )` are pair wise mutually perpendicular vectors of equal magnitude , then the angle wisv `bar(a)+bar(b)+bar (c )` is

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
a
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