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The non-zero vectors vec b and vec c are...

The non-zero vectors `vec b` and `vec c` are related by `vec a = 8 vec b` and `vec c = -7 vec 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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The correct Answer is:
D
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