The inverse of a 2 by 2 matrix seems to have determinant = 1: detA 1 = det 1 ad bc " d b
Chapter 4, Problem 4.2.21(choose chapter or problem)
The inverse of a 2 by 2 matrix seems to have determinant = 1: detA 1 = det 1 ad bc " d b c a # = ad bc ad bc = 1. What is wrong with this calculation? What is the correct detA 1 ?
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