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Text File  |  1997-06-17  |  129b  |  7 lines
  1. z=(15x2y2exp(-r2))/r
  2.  
  3. Note the usage of the variable ‚Äúr‚Äù.
  4.  
  5. It is actually possible to use:
  6. ‚Ä¢ r=‚àö(x2+y2)
  7. ‚Ä¢ Œ©, tanŒ©=y/x