acos (clj)

function

(acos a)

Returns the arc cosine of a, in the range 0.0 to pi. If a is ##NaN or |a|>1 => ##NaN See: https://docs.oracle.com/javase/8/docs/api/java/lang/Math.html#acos-double-

Examples

clojure

(ns clojure.test-clojure.math
  (:require
    [clojure.test :refer :all]
    [clojure.math :as m]))

(deftest test-acos
  (is (NaN? (m/acos ##NaN)))
  (is (NaN? (m/acos -2.0)))
  (is (NaN? (m/acos 2.0)))
  (is (ulp= (* 2 (m/acos 0.0)) m/PI 1)))