The non-zero vectors are vec a,vec b an...

The non-zero vectors are `vec a,vec b and vec c` are related by `vec a= 8vec b and vec c = -7vec b`. Then the angle between `vec a and vec c` is

A

0

B

`pi//4`

C

`pi//2`

D

`pi`

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Verified by Experts

The correct Answer is:

D

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