PHP Functions Essential Reference

asin

float asin(float float) 

Returns the calculated arcsine of the given argument.

Returns:

Arcsine of a number

Description:

asin() calculates the arcsine of a value.

Version:

PHP 3, PHP 4

See also:

acos() 
atan() 
atan2() 
cos() 
sin() 
tan() 

Example:

Calculate the arcsine of a value

$sin = 0.75; echo "The arcsine of $sin is ", asin($sin);