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-rw-r--r--Doc/library/decimal.rst6
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/decimal.rst b/Doc/library/decimal.rst
index d0dedda..d1e8bc7 100644
--- a/Doc/library/decimal.rst
+++ b/Doc/library/decimal.rst
@@ -1717,6 +1717,9 @@ to work with the :class:`Decimal` class::
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 @@ to work with the :class:`Decimal` class::
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))