Github user rvesse commented on the issue:
https://github.com/apache/jena/pull/205
We should already have support for most of the trigonometric functions
built into ARQ as extension functions -
https://github.com/apache/jena/tree/59e5e06c85c98c9c65a9c1addbc4252626e9d061/jena-arq/src/main/java/org/apache/jena/sparql/function/library/leviathan
For example:
```
sparql --data ~/Documents/Work/Datasets/minimal.nt "SELECT
(<http://www.dotnetrdf.org/leviathan#sin>(90) AS ?x) { }"
------------------------
| x |
========================
| 0.8939966636005579e0 |
------------------------
```
Notes:
- Inverse functions are named as `sin-1` etc.
- function arguments are expected to be radians
- convenience functions `degreesToRadians` and `radiansToDegrees` are
provided
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