“…As FDEs appear more and more frequently in various research and engineering applications, such as signal processing, control theory, viscoelasticity, biology, physics and electrochemistry (see refs [1][2][3][4][5][6] and references therein), they attract considerable interest and there has been a significant theoretical development recently (for example, see refs [2,4,5]). Also many powerful methods, for example, exponential function method [7,8], (G /G)-expansion method [9,10], first integral method [11,12], subequation method [13,14], functional variable method [15,16], modified simple equation method [17], modified trial equation method [18] and so on [19] have been proposed to obtain exact solutions of fractional differential equations.…”