[Python-checkins] r86631 - python/branches/py3k/Doc/library/decimal.rst

[raymond.hettinger]

Author: raymond.hettinger
Date: Sun Nov 21 03:47:22 2010
New Revision: 86631

Log:
Issue #7770: Note the useful range of sin/cos in the decimal module examples.

Modified:
   python/branches/py3k/Doc/library/decimal.rst

Modified: python/branches/py3k/Doc/library/decimal.rst
==============================================================================
--- python/branches/py3k/Doc/library/decimal.rst	(original)
+++ python/branches/py3k/Doc/library/decimal.rst	Sun Nov 21 03:47:22 2010
@@ -1717,6 +1717,9 @@
    def cos(x):
        """Return the cosine of x as measured in radians.
 
+       The taylor series approximation works best for a small value of x.
+       For larger values, first compute x = x % (2 * pi).
+
        >>> print(cos(Decimal('0.5')))
        0.8775825618903727161162815826
        >>> print(cos(0.5))
@@ -1740,6 +1743,9 @@
    def sin(x):
        """Return the sine of x as measured in radians.
 
+       The taylor series approximation works best for a small value of x.
+       For larger values, first compute x = x % (2 * pi).
+
        >>> print(sin(Decimal('0.5')))
        0.4794255386042030002732879352
        >>> print(sin(0.5))