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Let vec(a), vec(b) and vec(c) be three ...

Let `vec(a), vec(b) and vec(c) ` be three vectors such that `vec(a) + vec(b) + vec(c) = 0 and |vec(a)|=10, |vec(b)|=6 and |vec(c) |=14`.
What is the angle between `vec(a) and vec(b)`?

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