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diff --git a/gsl-1.9/specfunc/gsl_sf_trig.h b/gsl-1.9/specfunc/gsl_sf_trig.h
new file mode 100644
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+++ b/gsl-1.9/specfunc/gsl_sf_trig.h
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+/* specfunc/gsl_sf_trig.h
+ * 
+ * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+/* Author:  G. Jungman */
+
+#ifndef __GSL_SF_TRIG_H__
+#define __GSL_SF_TRIG_H__
+
+#include <gsl/gsl_sf_result.h>
+
+#undef __BEGIN_DECLS
+#undef __END_DECLS
+#ifdef __cplusplus
+# define __BEGIN_DECLS extern "C" {
+# define __END_DECLS }
+#else
+# define __BEGIN_DECLS /* empty */
+# define __END_DECLS /* empty */
+#endif
+
+__BEGIN_DECLS
+
+
+/* Sin(x) with GSL semantics. This is actually important
+ * because we want to control the error estimate, and trying
+ * to guess the error for the standard library implementation
+ * every time it is used would be a little goofy.
+ */
+int gsl_sf_sin_e(double x, gsl_sf_result * result);
+double gsl_sf_sin(const double x);
+
+
+/* Cos(x) with GSL semantics.
+ */
+int gsl_sf_cos_e(double x, gsl_sf_result * result);
+double gsl_sf_cos(const double x);
+
+
+/* Hypot(x,y) with GSL semantics.
+ */
+int gsl_sf_hypot_e(const double x, const double y, gsl_sf_result * result);
+double gsl_sf_hypot(const double x, const double y);
+
+
+/* Sin(z) for complex z
+ *
+ * exceptions: GSL_EOVRFLW
+ */
+int gsl_sf_complex_sin_e(const double zr, const double zi, gsl_sf_result * szr, gsl_sf_result * szi);
+
+
+/* Cos(z) for complex z
+ *
+ * exceptions: GSL_EOVRFLW
+ */
+int gsl_sf_complex_cos_e(const double zr, const double zi, gsl_sf_result * czr, gsl_sf_result * czi);
+
+
+/* Log(Sin(z)) for complex z
+ *
+ * exceptions: GSL_EDOM, GSL_ELOSS
+ */
+int gsl_sf_complex_logsin_e(const double zr, const double zi, gsl_sf_result * lszr, gsl_sf_result * lszi);
+
+
+/* Sinc(x) = sin(pi x) / (pi x)
+ *
+ * exceptions: none
+ */
+int gsl_sf_sinc_e(double x, gsl_sf_result * result);
+double gsl_sf_sinc(const double x);
+
+
+/* Log(Sinh(x)), x > 0
+ *
+ * exceptions: GSL_EDOM
+ */
+int gsl_sf_lnsinh_e(const double x, gsl_sf_result * result);
+double gsl_sf_lnsinh(const double x);
+
+
+/* Log(Cosh(x))
+ *
+ * exceptions: none
+ */
+int gsl_sf_lncosh_e(const double x, gsl_sf_result * result);
+double gsl_sf_lncosh(const double x);
+
+
+/* Convert polar to rectlinear coordinates.
+ *
+ * exceptions: GSL_ELOSS
+ */
+int gsl_sf_polar_to_rect(const double r, const double theta, gsl_sf_result * x, gsl_sf_result * y);
+
+/* Convert rectilinear to polar coordinates.
+ * return argument in range [-pi, pi]
+ *
+ * exceptions: GSL_EDOM
+ */
+int gsl_sf_rect_to_polar(const double x, const double y, gsl_sf_result * r, gsl_sf_result * theta);
+
+/* Sin(x) for quantity with an associated error.
+ */
+int gsl_sf_sin_err_e(const double x, const double dx, gsl_sf_result * result);
+
+
+/* Cos(x) for quantity with an associated error.
+ */
+int gsl_sf_cos_err_e(const double x, const double dx, gsl_sf_result * result);
+
+
+/* Force an angle to lie in the range (-pi,pi].
+ *
+ * exceptions: GSL_ELOSS
+ */
+int gsl_sf_angle_restrict_symm_e(double * theta);
+double gsl_sf_angle_restrict_symm(const double theta);
+
+
+/* Force an angle to lie in the range [0, 2pi)
+ *
+ * exceptions: GSL_ELOSS
+ */
+int gsl_sf_angle_restrict_pos_e(double * theta);
+double gsl_sf_angle_restrict_pos(const double theta);
+
+
+int gsl_sf_angle_restrict_symm_err_e(const double theta, gsl_sf_result * result);
+
+int gsl_sf_angle_restrict_pos_err_e(const double theta, gsl_sf_result * result);
+
+
+__END_DECLS
+
+#endif /* __GSL_SF_TRIG_H__ */