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Vectors vec(a), vec(b) and vec(c) are su...

Vectors `vec(a), vec(b)` and `vec(c)` are such that `vec(a) + vec(b) + vec(c) = vec0` and `|vec(a)| = 3, |vec(b)| = 5` and `|vec(c)| = 7`. Then, find the angle between `vec(a)` and `vec(b)`.

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Verified by Experts

The correct Answer is:
`(pi)/(3)`
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