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Why I could not Plot function?

  1. May 13, 2010 #1
    Hey every pro.
    Please help me to check with Plot function in Mathematica 7 like this: 9x2+18xy+13y2-4
    I only could Plot with "Plot3D[]", but could not get result with "Plot[]" only.
    Thanks!
     
  2. jcsd
  3. May 13, 2010 #2

    MATLABdude

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    Science Advisor

  4. May 13, 2010 #3
    Ok, I got it. Thank you so much!
     
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