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Hyperbolic paraboloid curve ?

  1. Oct 22, 2015 #1
    upload_2015-10-23_6-12-27.png
    then look at :
    upload_2015-10-23_6-13-12.png
    the 2 curves are nearly the same while the equations are not, is there anything wrong ?
     

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  2. jcsd
  3. Oct 22, 2015 #2
    i just saw that it demonstrates c < 0, i understood now
     
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