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asinh> <acosh
[edit] Last updated: Fri, 14 Jun 2013

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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()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))

参数

arg

待处理的参数

返回值

arg 的反正弦弧度。

参见



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