20070201
  u   To draw and analyze the axis of symmetry and directrix
  [G-SLV]-[SYM]/[DIR]
  Example  To draw the axis of symmetry and directrix for the parabola 
    X = 2(Y – 1)
 2
  + 1
    Use the following V-Window settings.
    Xmin = –6.3,  Xmax = 6.3,  Xscale = 1
    Ymin = –3.1,  Ymax = 3.1,  Yscale = 1  (initial defaults) 
  
  m CONICS
  w 
  c w b w b w6 (DRAW)
  !5 (G-SLV) 
  2 (SYM)
  (Draws the axis of symmetry.)
  
  
  
  !5 (G-SLV)
  3 (DIR) 
  (Draws the directrix.)
  
  
  
  
5-11-21
Function Analysis