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Simplifying a differential equation

  1. Apr 16, 2014 #1
    When I multiply out the first line I end up with an extra (dA/dx)*(dσ/dx). Can someone please show me how i get from the first line to the second. Thanks
     

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  3. Apr 17, 2014 #2

    Bill_K

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    The extra term is dA/dx · dσ/dx · dx · dx, which can be dropped because dx is an infinitesimal quantity and this term is second order in dx, infinitesimally smaller than the term you keep, which is first order.
     
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