If veca and vecb be two non-collinear un...

If `veca and vecb` be two non-collinear unit vectors such that `vecaxx(vecaxxvecb)=1/2vecb` then find the angle between `veca and vecb`.

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`vecaxx (vecaxxvecb) =1/2 vecb Rightarrow(veca.vecb)veca-(veca.veca) vecb= 1/2vecb`
`Rightarrrow veca.vecb = 0 , veca. Veca = -1/2 ` ( which is not possible).
thus, the given information is inconsistent.

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