📐 Mathematics · Relations and Functions (Class 12) · JEE

If f(x) = 1/x for x ≠ 0, then (f∘f)(x) equals:

Answer: x.

Correct answer: C. x

Explanation: f(f(x)) = 1/(1/x) = x, so f is its own inverse.

Concept context

Types of relations, equivalence classes, one-one and onto functions, composition, and invertible functions