This paper exhibits the application of integrability aspects to
a couple of nonlinear evolution equations. These are semi-inverse
variational principle and the rational sine-cosine method. These are
applied to extract solutions of Boiti-Leon-Manna-Pempinelli equation and
Breaking soliton equation. Soliton and other solutions will be retrieved
by the application of these two tools. The constraint conditions for the
parameters will also naturally emerge from the solution structures.
