(adsbygoogle = window.adsbygoogle || []).push({}); ϵ-N proof

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

I've tried to make the denominator smaller as is usual with ϵ-N proofs. But the sqrt(2) confuses me. Any help is much appreciated.

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# Homework Help: -N proof

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