Recent QCD results from NA48/2

In 2003 and 2004, the NA48/2 experiment collected an unprecedented statistics of charged kaon decays to measure the CP violation in three pions. An additional extensive physics program has been carried out. In particular, it was possible to verify the predictions of low energy QCD in several processes, with high precision. In this paper we present the precise measurement of the charged kaon semileptonic form factors (FF) and the first observation of the K⁺ → π⁺π⁰e⁺e⁻ decay. The semileptonic FF are measured on the sample collected in 2004 in a dedicated minimum bias run, to overcome the limitation imposed by the 3 pions triggers, while the first observation of the K⁺ → π⁺π⁰e⁺e⁻ decay is based on the full sample of data collected in two years.