More recently, another new modification of decomposition method was proposed by Wazwaz and El-Sayed [5]. In the new modification, the process of dividing into two components was replaced by a Taylor series of infinite components. The ideas have been shown to be computationally efficient in applying the proposed technique in several differential and integral equations. However, as will be seen from the examples below, the modified decomposition method will sometimes encounter obstacles to obtain the exact solution. After that, several authors further proposed expressing the function by the orthogonal polynomial series, such as Chebyshev series [6], Legendre series [7, 8], and Jacobi and Gegenbauer series [9].