asin()

asin - Arc sine

Syntax

float asin (float $arg)

Arguments

• arg - The argument to process

Description

Returns the arc sine of arg in radians. asin() is the complementary function of sin(), which means that a==sin(asin(a))for every value of a that is within asin() 's range.

Version

PHP 4, 5

Return value

The arc sine of arg in radians