Since \( f(x) \) is a rational function of degree \( \max(\deg ext{num}, \deg ext{den}) = 3 \), then \( f(f(x)) \) has degree at most \( 3 imes 3 = 9 \). So \( f(f(x)) - x = 0 \) is a rational equation whose numerator is a polynomial of degree at most 9.

Tue, 05 May 2026 12:54:31 +0000

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