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Let bar(a),bar(b) and bar(c) be non-zero...

Let `bar(a),bar(b)` and `bar(c)` be non-zero and non collinear vectors such that `(bar(a)times bar(b))times bar(c)=(1)/(3)|bar(b)||bar(c)|bar(a)` .If `theta` is the acute angle between the vectors `bar(b)` and `bar(c)` then `sin theta`

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