Subhanahu” means “tanzih”, i.e. فخ declare that Allah is clear of all unbefitting attributes. “Ta^ala” means the same, and is a reconfirmation of the same meaning. Allah is greatly clear of all the unbefitting attributes that the unjust blasphemers, attribute to Him. The blasphemers are unjust because blasphemy is the utmost, greatest, and most severe injustice. Allah ta^ala said in Surat al-Baqarah verse # 254:
﴿ والكافرون هم الظالمون﴾ سورة البقرة.
This verse means: […and the blasphemers are the unjust].