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Angular momentum proof not understanding?

  1. Apr 8, 2015 #1
    Hey all, i'm not understanding why the bits highlighted in red are equal? Any help appreciated, thanks.
     

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  2. jcsd
  3. Apr 8, 2015 #2

    phyzguy

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    Science Advisor

    It's just the product rule for derivatives, d(a*b) = da*b + a*db.
     
  4. Apr 8, 2015 #3
    Thanks you
     
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