Description: dot 2 e 2 the outer terms then the same thing with the inner terms and then the last This is how we find the vector length squared and know that these are dot products not multiplication symbols In fact, this is what we did beforehand. The three times three came from 3i 3i  countdown keto And sixteen came from four J dot four J But we forgot the outer terms of 3i for J. And the inner terms of for J dot 3i It's just that since the I hat and J hat or X and y direction are at right angles to each other When we do a dot product those terms would just come out to 0 So in summary

Publish Date: 27-01-20