Lines Matching refs:pi
19 * acos(x) = pi/2 - asin(x)
20 * acos(-x) = pi/2 + asin(x)
22 * acos(x) = pi/2 - (x + x*x^2*R(x^2)) (see asin.c)
24 * acos(x) = pi/2 - (pi/2 - 2asin(sqrt((1-x)/2)))
31 * acos(x) = pi - 2asin(sqrt((1-|x|)/2))
32 * = pi - 0.5*(s+s*z*R(z)), where z=(1-|x|)/2,s=sqrt(z)
48 pi = 3.14159265358979311600e+00, /* 0x400921FB, 0x54442D18 */
76 else return pi+2.0*pio2_lo; /* acos(-1)= pi */
94 return pi - 2.0*(s+w);
