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If |vec(a)| = 8, |vec(b)| = 3 and |vec(a...

If `|vec(a)| = 8, |vec(b)| = 3` and `|vec(a) xx vec(b)| = 12`, then find the angle between `vec(a)` and `vec(b)`.

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The correct Answer is:
`vec(a)` and `vec(b)` is `(pi)/(6)`.
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