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How can draw Focus(Points)

  • To: mathgroup at smc.vnet.net
  • Subject: [mg17139] How can draw Focus(Points)
  • From: Clara <cnoemia at ccg.uc.pt>
  • Date: Sat, 17 Apr 1999 03:35:25 -0400
  • Sender: owner-wri-mathgroup at wolfram.com

Hello

I am beginner in Mathematica. I have created the parabola using:
Plot1= Plot[ {y = 1/2x^2, y = -4}, {x, -4, 4},
AxesLabel -> {"xx","yy"}
, PlotStyle -> Hue[160/255],
AxesStyle -> Hue [160/255] ]

Now I want put the focus (point) in graphics. How can I do? Please help
me.



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