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If vec(a) + vec(b) + vec(c) = 0 and |vec...

If `vec(a) + vec(b) + vec(c) = 0 and |vec(a)| = 3, |vec(b)| = 5, |vec(c)| = 7`, find the angle between `vec(a) and vec(b)`.

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The correct Answer is:
`cos theta = (1)/(2)" "rArr" "theta = 60^(@)`
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