sech -- hyperbolic secant

• Usage:

  sech x

  sech I

• Inputs:
  • x
  • I, a real interval
• Outputs:
  • a real number, the hyperbolic secant of x
  • a real interval, an interval containing the hyerbolic secants of the points of I

i1 : sech(pi/3)

o1 = .6248879662960872

o1 : RR (of precision 53)