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| -rw-r--r-- | Doc/library/decimal.rst | 6 |
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)) |