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

see title.

2. Relevant equations

no

3. The attempt at a solution

Ok so the solution is 16cos(2x) but I'm not sure how it is derived to that. I've tried the product rule but it's not working for me. What rule or rules do I use to get this solution?

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# Homework Help: 4th derivative of cos(2x)

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