Method on @infsup: sech (X) ¶

Compute the hyperbolic secant, that is the reciprocal hyperbolic cosine.

Accuracy: The result is a tight enclosure.

sech (infsup (1))
  ⇒ ans ⊂ [0.64805, 0.64806]

See also: @@infsup/cosh, @@infsup/csch, @@infsup/coth.

Package: interval