# Horizons

**URL:** <https://boards.straightdope.com/t/horizons/18263>\
**Category:** Factual Questions\
**Created:** [May 1, 2000, 3:24pm UTC](https://boards.straightdope.com/t/horizons/18263 "2000-05-01T15:24:25Z")\
**Posts on this page:** 1\
**Page:** 2

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**Author:** ![RM\_Mentock](https://avatars.discourse-cdn.com/v4/letter/r/e274bd/32.png) [@RM\_Mentock](https://boards.straightdope.com/u/RM_Mentock)\
**Post date:** [May 2, 2000, 6:40am UTC](https://boards.straightdope.com/t/horizons/18263/21 "2000-05-02T06:40:50Z")

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tan(acos(x)) can be simplified so that it does not contain trig functions.

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