1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 24 */ 25 /* 26 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 27 * Use is subject to license terms. 28 */ 29 30 #pragma weak ccos = __ccos 31 32 /* INDENT OFF */ 33 /* 34 * dcomplex ccos(dcomplex z); 35 * 36 * z := x+iy; since ccos(iz) = cosh(z), we have 37 * ccos(z) = ccos((-1)*(-z)) = ccos(i*i*(-z)) 38 * = ccosh(i*(-z)) = ccosh(i*(-x-yi)) 39 * = ccosh(y-ix) 40 */ 41 /* INDENT ON */ 42 43 #include "libm.h" 44 #include "complex_wrapper.h" 45 46 dcomplex 47 ccos(dcomplex z) { 48 double x, y; 49 50 x = D_RE(z); 51 y = D_IM(z); 52 D_RE(z) = y; 53 D_IM(z) = -x; 54 return (ccosh(z)); 55 } 56