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Lines Matching defs:cacos

90  * The functions casin(h) and cacos(h) are about 2.5 times slower than asinh.
93  * The code for casinh, casin, cacos, and cacosh comes first.  The code is
103  *			| casinh, casin, cacos, cacosh |
169  * rx = Re(casinh(z)) = -Im(cacos(y + I*x)).
235 		 * later on.  For cacos this would not be legitimate.
367  * cacos(z) = PI/2 - casin(z)
368  * but do the computation carefully so cacos(z) is accurate when z is
371  * cacos(z) = PI/2 - z + O(z^3)   as z -> 0
373  * cacos(z) = -sign(y)*I*clog(z) + O(1/z^2)   as z -> infinity
375  * Re(cacos(z)) = atan2(fabs(y), x) + O(y/z^3)
379 cacos(double complex z)
394 		/* cacos(+-Inf + I*NaN) = NaN + I*opt(-)Inf */
397 		/* cacos(NaN + I*+-Inf) = NaN + I*-+Inf */
400 		/* cacos(0 + I*NaN) = PI/2 + I*NaN with inexact */
449  * cacosh(z) = I*cacos(z) or -I*cacos(z)
458 	w = cacos(z);