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5261 libm should stop using synonyms.h
5298 fabs is 0-sized, confuses dis(1) and others
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Approved by: Gordon Ross <gwr@nexenta.com>

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          --- old/usr/src/lib/libm/common/complex/ctanh.c
          +++ new/usr/src/lib/libm/common/complex/ctanh.c
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  20   20   */
  21   21  
  22   22  /*
  23   23   * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24   24   */
  25   25  /*
  26   26   * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27   27   * Use is subject to license terms.
  28   28   */
  29   29  
  30      -#pragma weak ctanh = __ctanh
       30 +#pragma weak __ctanh = ctanh
  31   31  
  32   32  /* INDENT OFF */
  33   33  /*
  34   34   * dcomplex ctanh(dcomplex z);
  35   35   *
  36   36   *            tanh x  + i tan y      sinh 2x  +  i sin 2y
  37   37   * ctanh z = --------------------- = --------------------
  38   38   *           1 + i tanh(x)tan(y)       cosh 2x + cos 2y
  39   39   *
  40   40   * For |x| >= prec/2 (14,28,34,60 for single, double, double extended, quad),
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