Question: Prove (1.84). Use Exercise 1.6.28 in the regular case. Then extend to the nonsingular case. Finally, explain why the result also holds for singular matrices.

Prove (1.84). Use Exercise 1.6.28 in the regular case. Then extend to the nonsingular case. Finally, explain why the result also holds for singular matrices.
det AT = det A. (1.84)

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