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asin> <acos
Last updated: Fri, 13 Nov 2009

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acosh

(PHP 4 >= 4.1.0, PHP 5)

acosh — 反双曲余弦

说明

float acosh ( float $arg )

返回 arg 的反双曲余弦值，即，其双曲余弦为 arg 的那个值。

Note: 本函数未在 Windows 平台下实现。

参见 acos()， asinh(), 和 atanh()。



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asin> <acos
Last updated: Fri, 13 Nov 2009
 
 
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