1.

If bare_(1) = (1,1,1), bare_(2) = (1,1,-1) and bara, barb " are two vectors such that " bare_(1)=2bara+barb and bare_(2)= bara+2barb, " then " (bara,barb)=

Answer»

`COS^(-1)(7//9)`
`cos^(-1)(7//11)`
`cos^(-1)(-7//11)`
`cos^(-1)(6sqrt2//11)`

ANSWER :C


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