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bpo-37548: Document range of atan, acos and asin (GH-14717)

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Giovanni Cappellotto 2019-07-13 09:59:55 -04:00 • committed by Mark Dickinson
parent e6b46aafad
commit dc3f99fa77
3 changed files with 13 additions and 6 deletions
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9
Doc/library/math.rst
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@ -366,17 +366,20 @@ Trigonometric functions
.. function:: acos(x) .. function:: acos(x)
Return the arc cosine of *x*, in radians. Return the arc cosine of *x*, in radians. The result is between ``0`` and
``pi``.
.. function:: asin(x) .. function:: asin(x)
Return the arc sine of *x*, in radians. Return the arc sine of *x*, in radians. The result is between ``-pi/2`` and
``pi/2``.
.. function:: atan(x) .. function:: atan(x)
Return the arc tangent of *x*, in radians. Return the arc tangent of *x*, in radians. The result is between ``-pi/2`` and
``pi/2``.
.. function:: atan2(y, x) .. function:: atan2(y, x)

1
Misc/ACKS
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@ -251,6 +251,7 @@ Jp Calderone
Arnaud Calmettes Arnaud Calmettes
Daniel Calvelo Daniel Calvelo
Tony Campbell Tony Campbell
Giovanni Cappellotto
Brett Cannon Brett Cannon
Tristan Carel Tristan Carel
Mike Carlton Mike Carlton

9
Modules/mathmodule.c
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@ -1072,19 +1072,22 @@ math_2(PyObject *const *args, Py_ssize_t nargs,
FUNC1(acos, acos, 0, FUNC1(acos, acos, 0,
"acos($module, x, /)\n--\n\n" "acos($module, x, /)\n--\n\n"
"Return the arc cosine (measured in radians) of x.") "Return the arc cosine (measured in radians) of x.\n\n"
"The result is between 0 and pi.")
FUNC1(acosh, m_acosh, 0, FUNC1(acosh, m_acosh, 0,
"acosh($module, x, /)\n--\n\n" "acosh($module, x, /)\n--\n\n"
"Return the inverse hyperbolic cosine of x.") "Return the inverse hyperbolic cosine of x.")
FUNC1(asin, asin, 0, FUNC1(asin, asin, 0,
"asin($module, x, /)\n--\n\n" "asin($module, x, /)\n--\n\n"
"Return the arc sine (measured in radians) of x.") "Return the arc sine (measured in radians) of x.\n\n"
"The result is between -pi/2 and pi/2.")
FUNC1(asinh, m_asinh, 0, FUNC1(asinh, m_asinh, 0,
"asinh($module, x, /)\n--\n\n" "asinh($module, x, /)\n--\n\n"
"Return the inverse hyperbolic sine of x.") "Return the inverse hyperbolic sine of x.")
FUNC1(atan, atan, 0, FUNC1(atan, atan, 0,
"atan($module, x, /)\n--\n\n" "atan($module, x, /)\n--\n\n"
"Return the arc tangent (measured in radians) of x.") "Return the arc tangent (measured in radians) of x.\n\n"
"The result is between -pi/2 and pi/2.")
FUNC2(atan2, m_atan2, FUNC2(atan2, m_atan2,
"atan2($module, y, x, /)\n--\n\n" "atan2($module, y, x, /)\n--\n\n"
"Return the arc tangent (measured in radians) of y/x.\n\n" "Return the arc tangent (measured in radians) of y/x.\n\n"