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If hat(a), hat(b), hat(c) are unit vecto...

If `hat(a), hat(b), hat(c)` are unit vectors and `hat(a) xx (hat(b) xx hat(c)) = (1)/(2)hat(b)`, then find the angles that `hat(a)` makes with `hat(b)` and `hat(c)` where `hat(b), hat(c)` are not parallel.

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The correct Answer is:
`theta=60^(@)`
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