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[" 27.Let "vec a,vec b" and "vec c" be t...

[" 27.Let "vec a,vec b" and "vec c" be three unit vectors,out of which vectors "bar(b)" and "vec c" are non-parallel.If "alpha" and "beta" are the "],[" angles which vector "bar(a)" makes with vectors "vec b" and "bar(c)" respectively and "vec a times(bar(b)timesvec c)=(1)/(2)bar(b)," then "| alpha-beta|" is equal "]

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