1.

For three vectors vec(a),vec(b) and vec( c ),vec(a)+vec(b)+vec( c )=vec(0)|vec(a)|=3,|vec(b)|=4,|vec( c )|=5, then evaluate 2(vec(a)*vec(b)+vec(b)*vec( c )+vec( c )*vec(a)).

Answer»

100
50
`-25`
`-50`

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