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If vec a and vec b are two vectors such ...

If `vec a` and `vec b` are two vectors such that `|bar(a)|=1,|vec b|=4,vec a*vec b=2` .If `vec c=(2vec a timesvec b)-3vec b` then find the angle between `bar(b)` and `vec c` is `theta` .Find `(6 theta)/(pi)`

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