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plot hyperbola


  HI, i am a beginner. Will u please tell me how to plot
hyperbola,parabola,ellipse and circle in their standard forms
   x^2/a^2 + y^2/b^2 = 1
  x^2/a^2 -- y^2/b^2 ==1 etc.
 Also how do you plot a general curve (y versus x), say
    x^2 +3 x^2 y^3 +67 x^4 y^2 +34==0
 *without solving explicitly for y* ( or x)
  Please help



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