Fix for #3894

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30533 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix Derivative[g(g(x))] again

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30534 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for #3792

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30536 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e