1.

Find the angle between the vectors if (| vec{a}|=| vec{b}|=3 sqrt{2} ) and ( vec{a}. vec{b}=9 sqrt{3} ).

A. ( frac{ }{6} )
B. ( frac{ }{5} )
C. ( frac{ }{3} )
D. ( frac{ }{2} )
Answer» B. ( frac{ }{5} )


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