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base_convert> <atan
Last updated: Fri, 13 Nov 2009

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atanh

(PHP 4 >= 4.1.0, PHP 5)

atanh — 反双曲正切

说明

float atanh ( float $arg )

返回 arg 的反双曲正切值，即，其双曲正切为 arg 的那个值。

Note: 本函数未在 Windows 平台下实现。

参见： atan()、 asinh()和 acosh()。



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base_convert> <atan
Last updated: Fri, 13 Nov 2009
 
 
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