Recent content by cuongktv

  1. C

    Mathematica Why Can't I Plot This Function in Mathematica 7?

    Ok, I got it. Thank you so much!
  2. C

    Mathematica Why Can't I Plot This Function in Mathematica 7?

    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!