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How to memorize the formula of the vertical and parallel coordinates of two vectors?
Let two vector coordinates be (x1, Y1, z1), (X2, Y2, Z2) (both are not zero vectors)
① Perpendicularity means that point multiplication is 0. Just remember the definition of point multiplication: each coordinate component corresponds to multiplication and then addition. So the formula of perpendicularity is x1x2 + y1y2 + z1z2 = 0
② Parallel is better to remember, that is, the corresponding coordinate component is proportional, X1: x2 = Y1: y2 = Z1: Z2
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