“…Many direct methods of nonlinear evolutions equations have been developed to find solutions, such as tanh-function method [25], functional variable method [4,5,7,9,10], Hirota method [23], Backlund transform method [32], exp-function method [28], G/G ′ expansion method [6,8] and extended tanh-method [19] are used for searching the exact solutions [2,3,11,20,26,27].…”