Table 6: Comparison of higher eigenvalues for Mathieu’s equation obtained from FDM, HWSM, and TDM corresponding to .

(FDM) (HWSM) (TDM) 1 1 −5.7311 −5.4665 −5.79008 2 4 2.0992 2.6161 2.09946 3 9 9.2365 9.4227 9.23633 4 16 16.648 16.3707 16.6482 5 25 25.511 24.1471 25.5108 6 36 36.359 36.6577 36.3589

(HWSM), −5.73115 (FDM), −5.79008 (TDM).