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If veca,vecb,vecc are 3 unit vectors su...

If `veca,vecb,vecc` are 3 unit vectors such that `vecaxx(vecbxxvecc)=vecb/2`then (`vecb and vecc` being non parallel). (a)angle between `veca & vecb` is `pi/3` (b)angle between `veca` and `vecc` is `pi/3` (c)angle between `veca` and `vecb` is `pi/2` (d)angle between `veca` and `vecc` is `pi/2`

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