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If `vec a, vec b, vec c` are three mutually perpendicular vectors of equal magnitude, then the angle `theta` which `vec a + vec b + vec c` makes with any one of three given vectors is given by

A

`cos^(-1) (1/sqrt3)`

B

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

C

`cos^2(1/sqrt3)`

D

none of these

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A
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