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let \vecu = \langle 2, 2, -1 \rangle e \vecv = \langle -1, 2, 2 \rangle, calcule \vecu*\vecv
let \vecu = \langle 2, 2, -1 \rangle e \vecv = \langle -1, 2, 2 \rangle, calcule \vecu*\vecv
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