# [Bug 28923] New: [FO31] editorial: math trigonometric functions

From: <bugzilla@jessica.w3.org>
Date: Tue, 07 Jul 2015 15:14:18 +0000

Message-ID: <bug-28923-523@http.www.w3.org/Bugs/Public/>
```https://www.w3.org/Bugs/Public/show_bug.cgi?id=28923

Bug ID: 28923
Summary: [FO31] editorial: math trigonometric functions
Product: XPath / XQuery / XSLT
Version: Candidate Recommendation
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: Functions and Operators 3.1
Assignee: mike@saxonica.com
Reporter: debbie@saxonica.com

1. The wording for the summary of math:sin "Returns the sine of the argument,
expressed in radians" is a little ambiguous - i.e. whether the second half of
the sentence refers to the argument, or the returned result. See also math:cos
and math:tan.

2. The results for the 4th and 5th examples of math:sin should say
"(approximately)" (like the 6th example). Similarly the 6th example of
math:cos.

3. The rules for math:asin say:
"Otherwise the result is the arc sine of \$θ, treated as an angle in
- Firstly the argument is \$arg not \$θ.
- Secondly, either remove the part which says "treated as an angle in radians",
or the wording should be rearranged to avoid the ambiguity of my first point,
e.g.
"Otherwise the result is an angle in radians, which is the arc sine of
\$arg,..."

Similarly, for math:acos and math:atan.

4. In the last note for math:asin, replace \$θ by θ in the given range.

Similarly, the last notes for math:acos and math:atan.

5. The results for the examples of math:atan2 use math:pi, but the other
trigonometric functions use 3.141592653589793e0 (approximately), etc. Should
these actually be the same?

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Received on Tuesday, 7 July 2015 15:14:20 UTC

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