** [bugs:#2570] Make acos(cos(x)) simplify to x when on correct interval**

**Status:** open

**Created:** Sun Apr 21, 2013 02:00 AM UTC by kcrisman

**Last Updated:** Sun Apr 21, 2013 02:00 AM UTC

**Owner:** nobody

Stavros comments at this Maxima thread that

The simplification acos(cos(x)) => x is only valid when 0 <= x <= %pi, so

Maxima by default does not perform that simplification. (And unfortunately,

it is not clever enough to perform it when x is declared to be in that

range.)

This still seems to be the case - see this ask.sagemath.org question. So... I nominate this as a bug, or at least a candidate for improvement, since asin(sin(x)) *does* seem to be smart enough.

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