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If for unit vectors bar(a) and bar(b),ba...

If for unit vectors `bar(a)` and `bar(b),bar(a)+2bar(b)` and `5bar(a)-4bar(b)` are perpendicular to each other, then `(bar(a)^^bar(b))=`

A

`pi/3`

B

`pi/4`

C

`"cos"^(-1)1/3`

D

`"cos"^(-1)2/7`

Text Solution

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The correct Answer is:
A
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