What is the complete name for the group whose debut studio album was Tri-Angle?
Tri-Angle Tri-Angle is the debut studio album by South Korean pop group TVXQ, released on October 11, 2004 by S.M. Entertainment. It sold 242,540 copies and became the eighth most successful album of the year in South Korea. The first single "Hug" debuted with 169,532 copies sold in 2004, peaking at number four on the national monthly chart. As of 2014, it sold 242,890 copies. In November 2004, the Japanese version of "Hug" was released in Japan by Rhythm Zone, ultimately selling 4,710 copies.
F(x) (band) f(x) ( ; Hangul: 에프엑스 ) is a South Korea-based girl group formed by S.M. Entertainment in 2009. Since their debut, f(x) has released four full-length albums, two extended plays, and one repackaged album. The group is currently composed of four members: Victoria, Luna, Amber, and Krystal. It was originally a five-piece group (with Sulli, who later departed from the group in August 2015).