The Periodic Solutions to Kawahara Equation by Means of the Auxiliary Equation with a Sixth-Degree Nonlinear Term

Figure 2

Graph of (36) for 𝛼=1/2, 𝑎₆=𝑔₀=𝑔₂=1, 𝑔₁=𝑔₃=−1, 𝑔₄=sin𝑥.