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5261 libm should stop using synonyms.h

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          --- old/usr/src/lib/libm/common/complex/ctan.c
          +++ new/usr/src/lib/libm/common/complex/ctan.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 ctan = __ctan
       30 +#pragma weak __ctan = ctan
  31   31  
  32   32  /* INDENT OFF */
  33   33  /*
  34   34   * dcomplex ctan(dcomplex z);
  35   35   *
  36   36   * If z = x+iy, then since ctan(iz) = i*ctanh(z),  we have
  37   37   *
  38   38   * ctan(z)      = ctan((-1)*(-z)) = ctan(i*i*(-z))
  39   39   *              = i*ctanh(i*(-z)) = i*ctanh(i*(-x-yi))
  40   40   *              = i*ctanh(y-ix)
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