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 ccosh = __ccosh
  31 
  32 /* INDENT OFF */
  33 /*
  34  * dcomplex ccosh(dcomplex z);
  35  *
  36  *             z      -z       x                      -x
  37  *            e   +  e        e  (cos(y)+i*sin(y)) + e  (cos(-y)+i*sin(-y))
  38  * cosh z = -------------- =  ---------------------------------------------
  39  *                2                                2
  40  *                     x    -x                x    -x
  41  *           cos(y) ( e  + e  )  + i*sin(y) (e  - e   )
  42  *        = --------------------------------------------
  43  *                               2
  44  *
  45  *        =  cos(y) cosh(x)  + i sin(y) sinh(x)
  46  *
  47  * Implementation Note
  48  * -------------------
  49  *
  50  *             |x|    -|x|   |x|        -2|x|       -2|x|    -P-4

  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 __ccosh = ccosh
  31 
  32 /* INDENT OFF */
  33 /*
  34  * dcomplex ccosh(dcomplex z);
  35  *
  36  *             z      -z       x                      -x
  37  *            e   +  e        e  (cos(y)+i*sin(y)) + e  (cos(-y)+i*sin(-y))
  38  * cosh z = -------------- =  ---------------------------------------------
  39  *                2                                2
  40  *                     x    -x                x    -x
  41  *           cos(y) ( e  + e  )  + i*sin(y) (e  - e   )
  42  *        = --------------------------------------------
  43  *                               2
  44  *
  45  *        =  cos(y) cosh(x)  + i sin(y) sinh(x)
  46  *
  47  * Implementation Note
  48  * -------------------
  49  *
  50  *             |x|    -|x|   |x|        -2|x|       -2|x|    -P-4