“…Problem (1.1)-(1.2) has been studied by many researchers, including Han [1], Powell [2], Yuan and Sun [3], Powell and Yuan [4], etc. There are many efficient methods to solve problem (1.1)-(1.2), and the trust region method is a very effective method (see [4][5][6][7][8][9][10][11][12][13]). In addition, the book of Conn, Gould, and Toint [14] is an excellent and comprehensive one on trust region methods.…”