1.

If bara,barb,barc " are three mutually perpendicular vectors such that " absbara = absbarb = absbarc, " then " (bara+barb+barc,bara)=

Answer»

`pi//3`
`COS^(-1)(1//3)`
`cos^(-1)(1//sqrt3)`
`cos^(-1)(2//3)`

ANSWER :C


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