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

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Raymond Hettinger 2010-11-21 02:47:22 +00:00
parent a491cedaf4
commit 2a1e3e29d4
1 changed files with 6 additions and 0 deletions
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6
Doc/library/decimal.rst
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@ -1717,6 +1717,9 @@ to work with the :class:`Decimal` class::
def cos(x): def cos(x):
"""Return the cosine of x as measured in radians. """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'))) >>> print(cos(Decimal('0.5')))
0.8775825618903727161162815826 0.8775825618903727161162815826
>>> print(cos(0.5)) >>> print(cos(0.5))
@ -1740,6 +1743,9 @@ to work with the :class:`Decimal` class::
def sin(x): def sin(x):
"""Return the sine of x as measured in radians. """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'))) >>> print(sin(Decimal('0.5')))
0.4794255386042030002732879352 0.4794255386042030002732879352
>>> print(sin(0.5)) >>> print(sin(0.5))