Lines Matching defs:pi
36 * acos(x) = pi/2 - asin(x)
37 * acos(-x) = pi/2 + asin(x)
39 * acos(x) = pi/2 - (x + x*x^2*R(x^2)) (see asin.c)
41 * acos(x) = pi/2 - (pi/2 - 2asin(sqrt((1-x)/2)))
48 * acos(x) = pi - 2asin(sqrt((1-|x|)/2))
49 * = pi - 0.5*(s+s*z*R(z)), where z=(1-|x|)/2,s=sqrt(z)
66 /* pi */ 3.14159265358979311600e+00, /* 400921FB, 54442D18 */
81 #define pi xxx[1]
108 else /* acos(-1) = pi */
109 return (pi + 2.0 * pio2_lo);
138 return (pi - 2.0 * (s + w));