New solitons and periodic wave solutions for some nonlinear physical models by using the sine-cosine method

In this paper, we establish exact solutions for nonlinear equations. The sine - cosine method is used to construct periodic and soliton solutions of nonlinear physical models. Many new families of exact travelling wave solutions of the symmetric regularized long-wave (SRLW) and the Klein-Gordon-Zakharov (KGZ) equations are successfully obtained. These solutions may be important for the explanation of some practical physical problems. It is shown that the sine - cosine method provides a powerful mathematical tool for solving a great many nonlinear partial differential equations in mathematical physics.