How many former members from the band where Zack De La Rocha was a rapper/vocalist took part in the Audioslave discography? 
Audioslave discography: The discography of Audioslave, an American hard rock band, consists of three studio albums, two extended plays (EPs), fourteen singles, two video albums and ten music videos. Formed in Los Angeles, California in 2001, Audioslave was a supergroup featuring former Soundgarden and Temple of the Dog vocalist Chris Cornell and three former members of Rage Against the Machine – guitarist Tom Morello, bassist Tim Commerford and drummer Brad Wilk. Audioslave discography:  Signed to Epic and Interscope Records, the band released its self-titled debut album in November 2002, which peaked at number 7 on the US "Billboard" 200. Audioslave discography:  Supported by five singles, all of which reached the top ten of the "Billboard" Mainstream Rock Songs chart, "Audioslave" was certified triple platinum by the Recording Industry Association of America (RIAA). Audioslave discography:  The band's first video album, also self-titled, was released in 2003 and reached number 5 on the "Billboard" Top Music Videos chart, receiving a gold certification from the RIAA. Rage Against the Machine: Rage Against the Machine is an American heavy metal band from Los Angeles, California. Rage Against the Machine:  Formed in 1991, the group consists of rapper and vocalist Zack de la Rocha, bassist and backing vocalist Tim Commerford, guitarist Tom Morello, and drummer Brad Wilk.
three