Question: please solve the problem 2.1. OLS Prove uv = 0 means that the angle between u and v is goo ( 2 ) The optimal

please solve the problem 2.1. OLS "Prove uv = 0 means

please solve the problem

2.1. OLS "Prove uv = 0 means that the angle between u and v is goo ( 2 ) The optimal fit of y = XB + E is derived from the above results which coincides with the orthogonality of the two vectors

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