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Require help for standard calculus equation

  1. Dec 7, 2009 #1
    Does anyone know how the standard equation is for a limit approaching a saturation limit x. I'm trying to model a concave down function where the dependent variable increases at a decreasing rate. see the graph below.
     
  2. jcsd
  3. Dec 7, 2009 #2
    I don't see any graph.
     
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