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If bar(a),bar(b) and bar(c) are non-copl...

If `bar(a),bar(b) and bar(c)` are non-coplanar unit vectors such that `bar(a)times(bar(b)timesbar(c))=(1)/(sqrt(2))(bar(b)+bar(c))`],then which of the following statements are correct
`A. (bar(a),bar(c))=(3 pi)/(4) B. (bar(a),bar(b))=(3 pi)/(4) C. (bar(a),bar(b)+bar(c))=(pi)/(2) D.(bar(b),bar(c))=0`

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