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Chain rule and product rule?

  1. Oct 8, 2015 #1
    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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  3. Oct 8, 2015 #2

    SteamKing

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