Competition problem — Algebra — Maths Olympiad Prep

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Algebra Difficulty 4.9 AIME Find the answer

4. Let the set $M=\left\{y \mid y=x^{2}-1\right\}, N=\left\{x \mid y=\sqrt{1-x^{2}}\right\}$ , then the relationship between $M$ and $N$ is

Pick one

Solution

4. A

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