1.

If |bar(a).bar(b)|=3 and |bar(a)xx bar(b)|=4 then the angle between bar(a) and bar(b) is ………………

Answer»

`cos^(-1)""(3)/(4)`
`cos^(-1)""(3)/(5)`
`cos^(-1)""(4)/(5)`
`(PI)/(4)`

Answer :B


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