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The magnitudes of vectors vec A, vec B a...

The magnitudes of vectors `vec A, vec B and vec C` are 3, 4 and 5 units respectively. If `vec A+ vec B = vec C`, the angle between `vec A and vec B` is

A

`pi//2`

B

`cos^-10.6`

C

`tan^-1 7//5`

D

`pi//4`

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