“…It has recently become more interesting to obtain exact solutions of nonlinear partial differential equations (NPDEs) using symbolic computation softwares such as Maple, Mathematica and Matlab that facilitate complex and tedious algebraical computations. In recent years, various effective methods have been developed to find the exact solutions of NPDEs, such as tanh-function method [4,5,6,7,8,9,10,11], generalized hyperbolic function method [12], homogeneous balance method [13,14], Jacobi-elliptic function method [15,16,17], exp-function method [18,19], auxiliary equation method [20,21,22,23,24] and so on, e.g. see [25,26,27].…”