fix for erf(-∞)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33468 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix for erf(-∞)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33469 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
fix compile error (unused import)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@33471 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e