Math Olympiad Problem - Functions- You need to learn this trick!

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🤓 Math Olympiad Problem - Functions- You need to learn this trick!
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[@zhemoytuk]

2nd method is incorrect. Function f is not a bijection, therefore it's not invertible. E.g. f(0) = f(1), and it does not mean that 0 = 1.

[@Mathcentricmind]

You are right, the point at y=1, it has two value. I missed that part. Thank you for the contribution.