| 释义 |
arc-hyperbolic cosine arc-hyperbolic cosine[‚ärk ‚hī·pər‚bäl·ik ′kō‚sīn] (mathematics) Also known as inverse hyperbolic cosine. For a number, x, equal to or greater than 1, either of the two numbers whose hyperbolic cosine equals x. For a number, x, equal to or greater than 1, the positive number whose hyperbolic cosine equals x ; it is the value at x of the restriction of the inverse of the hyperbolic cosine function to the positive numbers. |