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pacixor
@pacixor
November 2021
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irishkax1
|-4a+4b|²=16a²-32ab+16b²=16-32*(1/2)+16=16
ab=|a|*|b|*cos ∠(a; b)=1*1*cos60=1/2
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Answers & Comments
ab=|a|*|b|*cos ∠(a; b)=1*1*cos60=1/2