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If vec a, vec b and vec c are non coplan...

If `vec a, vec b` and `vec c` are non coplanar unit vectors such that `vec a xx (vec b xx vec c) = (vec b + vec c)/sqrt2`, then

A

`(3pi)/4`

B

`pi/4`

C

`pi/2`

D

`pi`

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The correct Answer is:
A
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