double asin

(

double

x

)

Returns the arcsine of x within the range of -π/2 to π/2 radians

Parameters

x	The val value between -1 and 1, the arc sine of which is to be calculated

Returns

Arc sine of the val number in radians within the range of -π/2 to π/2 radians. If val is less than -1 or more than 1, the function returns NaN (indeterminate value)