“…Solitons exhibit the particle-like properties because the energy is at any instant confined to a limited region of space (Ghanbari & Nisar, 2020;Nisar et al, 2021;Zafar, Ali, Raheel, Jafar, & Nisar, 2020). With the development of soliton theory, many powerful methods for obtaining exact solutions of NLPDEs have been presented, such as homotopy perturbation method, nonperturbative method, homogeneous balance method, Backlund transformation, Darboux transformation, extended tanh-function method, extended F-expansion method, G 0 G method, exp-function method, sine-cosine method, Jacobi elliptic function method, extended Riccati equation rational expansion method, extended auxiliary function method and other methods (Achab et al, 2020;Akbar, Alam, & Hafez, 2016;Alam, Hafez, Akbar, & Roshid, 2015;Ali Akbar, Ali, & Tarikul Islam, 2019;Duan & Lu, 2021;Hong & Lu, 2013;Islam, Akbar, & Khan, 2018;Kazi Sazzad Hossain & Ali Akbar, 2017;Lu, 2018;Mahmud, Samsuzzoha, & Akbar, 2017;Mohyud-Din, Nawaz, Azhar, & Akbar, 2017;Nur Alam1, Ali Akbar, & Fazlul Hoque, 2014;Shafiqul Islam, Khan, Ali Akbar, & Mastroberardino, 2014). In this article, we used the sine Gordon expansion method and extended tanh function method to the (3 þ 1) dimensional Boiti-Leon-Manna-Pempinelli equation (BLMP) which is used to describe incompressible liquid in fluid mechanics (Wazwaz, 2019).…”