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Fundamental data science question — Why |a||b|cos(x)=x1y1+x2y2?

Fundamental data science question — Why |a||b|cos(x)=x1y1+x2y2?

a year ago
Anonymous $pUsIN4hzN9

https://iorilan.medium.com/fundamental-data-science-question-why-a-b-cos-x-x1y1-x2y2-d9c45961c26c