asin() - math

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.

Parameters : 
 arg - The argument to process 

Syntax

float asin
     ( float $arg
    )

Example

Output / Return Value

Limitations

Alternatives / See Also

Reference