Lines Matching refs:acos
13 /* acos(x)
15 * acos(x) = pi/2 - asin(x)
16 * acos(-x) = pi/2 + asin(x)
18 * acos(x) = pi/2 - (x + x*x^2*R(x^2)) (see asin.c)
20 * acos(x) = pi/2 - (pi/2 - 2asin(sqrt((1-x)/2)))
27 * acos(x) = pi - 2asin(sqrt((1-|x|)/2))
61 acos(double x)
71 if(hx>0) return 0.0; /* acos(1) = 0 */
72 else return pi+2.0*pio2_lo; /* acos(-1)= pi */
74 return (x-x)/(x-x); /* acos(|x|>1) is NaN */
106 __weak_reference(acos, acosl);