Cosine of the angle between the lines ov...

Cosine of the angle between the lines `overliner=5hati-hatj+4hatk+lamda(hati+2hatj+2hatk)`and `overliner=7hati+2hatj+2hatk+mu(3hati+2hatj+6hatk)`is

A

0

B

`1/2`

C

`19/21`

D

`1/3`

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The correct Answer is:

C

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