Exact Solutions with Bounded Periodic Amplitude for Kundu Equation and Derivative Nonlinear Schrödinger Equation

In this paper, exact solutions with bounded periodic amplitude to Kundu equation are obtained through transformation, direct integration method and trial function method when the parameters satisfy certain conditions. By the way, exact solutions for the derivative nonlinear Schrödinger equation are also obtained. Two solutions' images are displayed. These results greatly enrich the solutions' structural diversity for these equations.