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Let bara=2bari+barj-2bark,barb=bari+barj...

Let `bara=2bari+barj-2bark,barb=bari+barj`. If `barc` is a vector such that `bara.barc=abs(barc),abs(barc-bara)=2sqrt2` and the angle between `(baraxxbarb)` and `barc` is `30^(@)`, then `abs((baraxxbarb)xxbarc)=`

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