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Text File  |  1993-10-16  |  110 b   |  5 lines
  1. sech(0) := 1
  2. sech(inf) := 0
  3. sech(-inf) := 0
  4. sech(x_) :=  if( isnumber(x) and numeric==on, 2/(e^x+e^-x) )
  5.