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If three unit vectors veca, vecb and vec...

If three unit vectors `veca, vecb and vecc " satisfy" veca+vecb+vecc= vec0`. Then find the angle between `vecb and vecc`.

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`veca+vecb=-vecc`
`|veca+vecb|^(2)+2veca.vecb=1`
` veca.vecb=-1/2`
`|veca||vecb|cos theta =-1/2`
or `cos theta = 1/2`
`theta= (2pi)/3`
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