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Let vec(u),vec(v),vec(w)" be vectors suc...

Let `vec(u),vec(v),vec(w)" be vectors such that "vec(u)+vec(v)+vec(w)=vec(0)." If abvec(u)=3,absvec(v)=4,absvec(w)=5" then "vec(u).vec(v)+vec(v).vec(w)+vec(w).vec(u)` is ……………

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