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Text File  |  1993-10-16  |  113 b   |  5 lines
  1. cosh(0) := 1
  2. cosh(inf) := inf
  3. cosh(-inf) := inf
  4. cosh(x_) := if( isnumber(x) and numeric==on, (e^x+e^-x)/2 )
  5.