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diff --git a/mpfr/tests/tcot.c b/mpfr/tests/tcot.c
new file mode 100644
index 00000000..2d44300c
--- /dev/null
+++ b/mpfr/tests/tcot.c
@@ -0,0 +1,144 @@
+/* Test file for mpfr_cot.
+
+Copyright 2005, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
+Contributed by the Arenaire and Cacao projects, INRIA.
+
+This file is part of the GNU MPFR Library.
+
+The GNU MPFR Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or (at your
+option) any later version.
+
+The GNU MPFR Library 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 Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MPFR Library; see the file COPYING.LIB.  If not, write to
+the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+MA 02110-1301, USA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "mpfr-test.h"
+
+#define TEST_FUNCTION mpfr_cot
+#define REDUCE_EMAX 262143 /* otherwise arg. reduction is too expensive */
+#include "tgeneric.c"
+
+static void
+check_specials (void)
+{
+  mpfr_t  x, y;
+
+  mpfr_init2 (x, 123L);
+  mpfr_init2 (y, 123L);
+
+  mpfr_set_nan (x);
+  mpfr_cot (y, x, GMP_RNDN);
+  if (! mpfr_nan_p (y))
+    {
+      printf ("Error: cot(NaN) != NaN\n");
+      exit (1);
+    }
+
+  mpfr_set_inf (x, 1);
+  mpfr_cot (y, x, GMP_RNDN);
+  if (! mpfr_nan_p (y))
+    {
+      printf ("Error: cot(Inf) != NaN\n");
+      exit (1);
+    }
+
+  mpfr_set_inf (x, -1);
+  mpfr_cot (y, x, GMP_RNDN);
+  if (! mpfr_nan_p (y))
+    {
+      printf ("Error: cot(-Inf) != NaN\n");
+      exit (1);
+    }
+
+  /* cot(+/-0) = +/-Inf */
+  mpfr_set_ui (x, 0, GMP_RNDN);
+  mpfr_cot (y, x, GMP_RNDN);
+  if (! (mpfr_inf_p (y) && mpfr_sgn (y) > 0))
+    {
+      printf ("Error: cot(+0) != +Inf\n");
+      exit (1);
+    }
+  mpfr_neg (x, x, GMP_RNDN);
+  mpfr_cot (y, x, GMP_RNDN);
+  if (! (mpfr_inf_p (y) && mpfr_sgn (y) < 0))
+    {
+      printf ("Error: cot(-0) != -Inf\n");
+      exit (1);
+    }
+
+  mpfr_clear (x);
+  mpfr_clear (y);
+}
+
+static void
+two2emin (mp_exp_t e)
+{
+  mp_exp_t old_emin, old_emax;
+  mpfr_t x, y;
+  int i, rnd;
+
+  old_emin = mpfr_get_emin ();
+  old_emax = mpfr_get_emax ();
+
+  if (mpfr_set_emin (-e) || mpfr_set_emax (e))
+    {
+      printf ("Can't change exponent range\n");
+      exit (1);
+    }
+
+  mpfr_inits2 (53, x, y, (mpfr_ptr) 0);
+  for (i = -4; i <= 4; i++)
+    RND_LOOP (rnd)
+      {
+        mpfr_set_si (y, i, GMP_RNDN);
+        mpfr_ui_div (y, 1, y, (mp_rnd_t) rnd);  /* no overflow/underflow */
+        mpfr_set_si_2exp (x, i, -e, GMP_RNDN);
+        if (ABS (i) != 3)  /* not a power of 2 (not 0 either) */
+          mpfr_sub (y, y, x, (mp_rnd_t) rnd);  /* no overflow/underflow */
+        mpfr_set_ui_2exp (x, 1, -e, GMP_RNDN);
+        mpfr_div (y, y, x, (mp_rnd_t) rnd);  /* 1/x - SIGN(x).epsilon */
+        mpfr_set_si_2exp (x, i, -e, GMP_RNDN);
+        mpfr_cot (x, x, (mp_rnd_t) rnd);
+        if (! mpfr_equal_p (x, y))
+          {
+            printf ("Error in two2emin for i = %d and rnd = %s\n",
+                    i, mpfr_print_rnd_mode ((mp_rnd_t) rnd));
+            printf ("Got        ");
+            mpfr_dump (x);
+            printf ("instead of ");
+            mpfr_dump (y);
+            exit (1);
+          }
+      }
+  mpfr_clears (x, y, (mpfr_ptr) 0);
+
+  mpfr_set_emin (old_emin);
+  mpfr_set_emax (old_emax);
+}
+
+int
+main (int argc, char *argv[])
+{
+  tests_start_mpfr ();
+
+  check_specials ();
+  two2emin (256);
+  two2emin (MPFR_EMAX_DEFAULT);
+  if (MPFR_EMAX_MAX != MPFR_EMAX_DEFAULT)
+    two2emin (MPFR_EMAX_MAX);
+  test_generic (2, 200, 5);
+
+  tests_end_mpfr ();
+  return 0;
+}