If f(f(x)) = x for all x in domain, and f is one-one, then f(f(x)) = $x$. (Find the property)
Answer (integer)
1
Solution
f(f(x)) = x for all x means f is an involution — it is its own inverse. f = f⁻¹.
About this question
Subject: Mathematics · Chapter: Sets, Relations and Functions · Topic: Composite and Inverse Functions
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