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diff --git a/src/elementaryFunctions/tan/ztans.c b/src/elementaryFunctions/tan/ztans.c
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--- a/src/elementaryFunctions/tan/ztans.c
+++ /dev/null
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-/*
- *  Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
- *  Copyright (C) 2006-2008 - INRIA - Bruno JOFRET
- *
- *  This file must be used under the terms of the CeCILL.
- *  This source file is licensed as described in the file COPYING, which
- *  you should have received as part of this distribution.  The terms
- *  are also available at
- *  http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
- *
- */
-
-/*
-  ALGORITHM
-   based on the formula :
-
-                    0.5 sin(2 xr) +  i 0.5 sinh(2 xi)
-   tan(xr + i xi) = ---------------------------------
-                        cos(xr)^2  + sinh(xi)^2
-
-   noting  d = cos(xr)^2 + sinh(xi)^2, we have :
-
-           yr = 0.5 * sin(2 * xr) / d       (1)
-
-           yi = 0.5 * sinh(2 * xi) / d      (2)
-
-   to avoid spurious overflows in computing yi with
-   formula (2) (which results in NaN for yi)
-   we use also the following formula :
-
-           yi = sign(xi)   when |xi| > LIM  (3)
-
-   Explanations for (3) :
-
-   we have d = sinh(xi)^2 ( 1 + (cos(xr)/sinh(xi))^2 ),
-   so when :
-
-      (cos(xr)/sinh(xi))^2 < epsm   ( epsm = max relative error
-                                     for coding a real in a f.p.
-                                     number set F(b,p,emin,emax)
-                                        epsm = 0.5 b^(1-p) )
-   which is forced  when :
-
-       1/sinh(xi)^2 < epsm   (4)
-   <=> |xi| > asinh(1/sqrt(epsm)) (= 19.06... in ieee 754 double)
-
-   sinh(xi)^2 is a good approximation for d (relative to the f.p.
-   arithmetic used) and then yr may be approximate with :
-
-    yr = cosh(xi)/sinh(xi)
-       = sign(xi) (1 + exp(-2 |xi|))/(1 - exp(-2|xi|))
-       = sign(xi) (1 + 2 u + 2 u^2 + 2 u^3 + ...)
-
-   with u = exp(-2 |xi|)). Now when :
-
-       2 exp(-2|xi|) < epsm  (2)
-   <=> |xi| > 0.5 * log(2/epsm) (= 18.71... in ieee 754 double)
-
-   sign(xi)  is a good approximation for yr.
-
-   Constraint (1) is stronger than (2) and we take finaly
-
-   LIM = 1 + log(2/sqrt(epsm))
-
-   (log(2/sqrt(epsm)) being very near asinh(1/sqrt(epsm))
-
-AUTHOR
-   Bruno Pincon <Bruno.Pincon@iecn.u-nancy.fr>
-*/
-
-#include <math.h>
-#include "lapack.h"
-#include "tan.h"
-#include "sqrt.h"
-#include "cos.h"
-#include "sinh.h"
-#include "sin.h"
-#include "log.h"
-#include "abs.h"
-
-#define localSign(x) x >= 0 ? 1.0 : -1.0
-
-doubleComplex		ztans(doubleComplex z) {
-  double Temp = 0;
-  double Lim = 1 + dlogs(2.0 / dsqrts( getRelativeMachinePrecision()));
-  double RealIn = zreals(z);
-  double ImagIn = zimags(z);
-  double RealOut = 0;
-  double ImagOut = 0;
-
-  Temp = pow(dcoss(RealIn), 2) + pow(dsinhs(ImagIn), 2);
-  RealOut = 0.5 * dsins(2 * RealIn) / Temp;
-  if(dabss(ImagIn) < Lim)
-    {
-      ImagOut = 0.5 * dsinhs(2 * ImagIn) / Temp;
-    }
-  else
-    {
-      ImagOut = localSign(ImagIn);
-    }
-
-  return DoubleComplex(RealOut, ImagOut);
-}