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If `vec a + vec b + vec c = 0` and `|vec a|= 3, |vec b| = 4` and `|vec c| = sqrt37`, then the angle between `vec a` and `vec b` is

A

`pi/4`

B

`pi/2`

C

`pi/6`

D

`pi/3`

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The correct Answer is:
D
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