Method on @infsup: sec (X) ¶

Compute the secant in radians, that is the reciprocal cosine.

Accuracy: The result is a tight enclosure.

sec (infsup (1))
  ⇒ ans ⊂ [1.8508, 1.8509]

See also: @@infsup/cos, @@infsup/csc, @@infsup/cot.

Package: interval