1.

For unit vectors bar(a) and bar(b), if bar(a)+2bar(b) and 5bar(a)-4bar(b) are perpendicular to each other then the angle between bar(a) and bar(b) is ………….

Answer»

`45^(@)`
`60^(@)`
`COS^(-1)((1)/(3))`
`cos^(-1)""(2)/(7)`

ANSWER :B


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