Index: Doc/library/decimal.rst
===================================================================
--- Doc/library/decimal.rst	(revision 77721)
+++ Doc/library/decimal.rst	(working copy)
@@ -1776,13 +1776,10 @@
 
        >>> print cos(Decimal('0.5'))
        0.8775825618903727161162815826
-       >>> print cos(0.5)
-       0.87758256189
-       >>> print cos(0.5+0j)
-       (0.87758256189+0j)
 
        """
        getcontext().prec += 2
+       x = x.remainder_near(2*pi())
        i, lasts, s, fact, num, sign = 0, 0, 1, 1, 1, 1
        while s != lasts:
            lasts = s
@@ -1799,13 +1796,10 @@
 
        >>> print sin(Decimal('0.5'))
        0.4794255386042030002732879352
-       >>> print sin(0.5)
-       0.479425538604
-       >>> print sin(0.5+0j)
-       (0.479425538604+0j)
 
        """
        getcontext().prec += 2
+       x = x.remainder_near(2*pi())
        i, lasts, s, fact, num, sign = 1, 0, x, 1, x, 1
        while s != lasts:
            lasts = s