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Dot Product -- from Wolfram MathWorld
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日期：2025-06-21
The dot product can be defined for two vectors X and Y by X·Y=|X||Y|costheta, (1) where theta is the angle between the vectors and |X| is the norm. It follows immediately that X·Y=0 if X is perpendicular to Y. The dot product therefore has the geometric ....看更多
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