Prove that 𝑓 ∶ ℤ → ℤ. Let 𝑓^2 = 𝑓 ∘ 𝑓. Prove that if 𝑓^2 is injective then f is injective.
Hint: May prove by contradiction, that is, if f is not injective then f^2 is not injective.
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