Talk:Quaternions and spatial rotation: Difference between revisions

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Recovering the axis-angle representation
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As the sentence is, it is just jarring and almost anything else would be better in my opinion. [[Special:Contributions/130.232.105.232|130.232.105.232]] ([[User talk:130.232.105.232|talk]]) 08:13, 7 February 2018 (UTC)
 
== Recovering the axis-angle representation ==
From the definition looks like the angle is 2*arccos(w). Why it is now a different expression including atan? Is it a different angle now? Is it w no longer cos(w/2)?