ab=x₁x₂+y₁y₂+z₁z₂
ab=(-2)*(-1)+3*(-1)+1*4=2-3+4=-1+4=3
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ab=x₁x₂+y₁y₂+z₁z₂
ab=(-2)*(-1)+3*(-1)+1*4=2-3+4=-1+4=3