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Math Help - differentiation: first principles

  1. #1
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    differentiation: first principles

    Please see
    http://i1163.photobucket.com/albums/...tprinciple.jpg
    I can't follow the steps. How does the 2nd step go to the 3rd one?

    Thanks a lot!
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: differentiation: first principles

    Each term in the numerator and denominator has been divided by the common factor \Delta x.
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