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asinh> <acosh
Last updated: Fri, 13 Nov 2009

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asin

(PHP 4, PHP 5)

asin — 反正弦

说明

float asin ( float $arg )

返回 arg 的反正弦值，单位是弧度。asin() 是 sin() 的反函数，它的意思是在 asin() 范围里的每个值都是 a==sin(asin(a)) 。

参见 asinh(), acos() 和 atan()。



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asinh> <acosh
Last updated: Fri, 13 Nov 2009
 
 
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