Question: Prove Theorem 5.9. If f: A -> B, g: B -> C are invertible functions, then g o f: A -> C is invertible and

Prove Theorem 5.9.
If f: A -> B, g: B -> C are invertible functions, then g o f: A -> C is invertible and (g 0 f)-1 = f-1 °g-1.

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