# Chain rule and product rule?

1. Oct 8, 2015

### Anon.ilbe

Im stuck on theorem 5 where the book used chain rule then used product rule then again using the chain rule. How in the world does it work? I dont get product rule used and chain rule used after.

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2. Oct 8, 2015

### SteamKing

Staff Emeritus
Gee, it would really be nice if we got a look at that expression in part (a), as mentioned in the text.