extract method

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26720 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Small styling for navigation bar. (#3246)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26721 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
minor changes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26722 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
[giac] fix an infinite recursion in expln2trig

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@26723 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e