Show algebraically that f and g are inverse functions. 
Definitions:
Excess
An amount or quantity greater than what is considered normal or sufficient.
Pruritus
The medical term for itching, a common symptom causing the desire or reflex to scratch.
Hearing
The ability or process of perceiving sound.
5-Year-Old
A child who is five years of age, a period characterized by rapid development in motor skills, language, and social interaction.
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