When does the inverse exist; domain and range of f⁻¹
💡 The ideaf has an inverse only if it is one-one: for a quadratic, the domain must stay on one side of the turning point. The domain of f⁻¹ is the range of f, and the range of f⁻¹ is the domain of f.
📖 Worked example · same type, different numbers
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