Question: Calculus question Let A be a 2 X 2 matrix, such that the columns are unitary vectors and orthogonal. Prove that A is ilnvertible and

Calculus question

Calculus question Let A be a 2 X 2 matrix, such that

Let A be a 2 X 2 matrix, such that the columns are unitary vectors and orthogonal. Prove that A is ilnvertible and that A' = At

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