1.

If bara = 3bari - 4barj +5bark, barb = 2bari+3barj-bark ," then the angle between " bara and barb is

Answer»

`pi+COS^(-1)(11/(10sqrt7))`
`pi-cos^(-1)(11/(10sqrt7))`
`cos^(-1)(11/(10sqrt7))`
`-cos^(-1)(11/(10sqrt7))`

ANSWER :B


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