43:30 How can column space of Q be same as column space of A?? I know that their dimensions are same, but Q is composed with orthogonal vectos and A is not. I need some helps guys {{{(>_<)}}}####[['dimensions', 'Mathematical_Related_Concept', 'NEU'], ['orthogonal vectos', 'Mathematical_Related_Concept', 'NEU'], ['column space of Q', 'Mathematical_Related_Concept', 'NEU'], ['column space of A', 'Mathematical_Related_Concept', 'NEU']]