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If 2 vec a . vec b = |vec a|.|vec b| the...

If `2 vec a . vec b = |vec a|.|vec b|` then the between `vec a` and `vec b` is

A

`90^(o)`

B

`30^(o)`

C

`60^(o)`

D

`45^(o)`

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The correct Answer is:
C
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