But since \( f(f(x)) \) is odd (as composition of odd functions), and \( x \) is odd, the equation \( f(f(x)) = x \) is equivalent to \( g(x) = 0 \) where \( g \) is a degree ⤠9 polynomial, odd. - AMAZONAWS 📅 March 6, 2026 👤 scraface Mar 06, 2026