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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

`pi`

B

0

C

`(pi)/(4)`

D

`(pi)/(2)`

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The correct Answer is:
A
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