Lines Matching defs:asin

30 #pragma weak __asin = asin
34  * asin(x)
36  *	Since  asin(x) = x + x^3/6 + x^5*3/40 + x^7*15/336 + ...
37  *	we approximate asin(x) on [0,0.5] by
38  *		asin(x) = x + x*x^2*R(x^2)
40  *		R(x^2) is a rational approximation of (asin(x)-x)/x^3
42  *		|(asin(x)-x)/x^3 - R(x^2)| < 2^(-58.75)
45  *		asin(x) = pi/2-2*asin(sqrt((1-x)/2))
48  *		asin(x) = pi/2 - 2*(s+s*z*R(z))
54  *		asin(x) = pi/2 - 2*(s+s*z*R(z))
106 asin(double x) {
114 			/* asin(1)=+-pi/2 with inexact */
121 			return (x - x) / (x - x);	/* asin(|x|>1) is NaN */