Let bara=bari+2hatj+3hatk, barb= -bari+2...

Let `bara=bari+2hatj+3hatk, barb= -bari+2hatj+3bark, barc=3hati+hatj` and `bard` is a non zero vector perpendicular to both `bara` and `barb`. If `(barc, bard)=theta` then `cos theta=`

A

`(-3)/(sqrt(130))`

B

`(-5)/(sqrt(130))`

C

`(2)/(sqrt(130))`

D

`(1)/(sqrt(130))`

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The correct Answer is:

A

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