(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Hi. For a project I have to derive this formula for bright fringes in optics, but i'm stuck on this simple math part (or maybe its not so simple)...ive attached a picture of where i don't understand...it might be considered a simple math problem so i'm sorry if this is too trivial a question for physics forums :)

2. Relevant equations

3. The attempt at a solution

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# Homework Help: Stuck on math in deriving an optics equation

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