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At 2:30 you make and error saying that it = a^2-ab+b^2. It is, in fact = A^2-2ab-b^2. You use the correct expansion in the square brackets after that though.
Thanks
At 2:30 you make and error saying that it = a^2-ab+b^2. It is, in fact = A^2-2ab-b^2. You use the correct expansion in the square brackets after that though.
Thanks