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The angle between the vectors veca=hat i...

The angle between the vectors `veca=hat i -2hat j+3 hat k `and `hat b=3hat i-2 hatj -hat k` is :

A

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

B

`cos^(-1) (5/7)`

C

cos^(-1) (6/7)`

D

None of these

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The correct Answer is:
A
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