Table 2 Values of ${\mathit{f}}^{\mathbf{″}}\mathbf{(}\mathbf{0}\mathbf{)}$ for $\mathit{\lambda }\mathbf{=}\mathbf{-}\mathbf{0.4}$ , $\mathit{\beta }\mathbf{=}\mathbf{0.05}$

First solution

$f^{″}(0)=0.3862$

$f^{″}(0)=0.3864$

Second solution

$f^{″}(0)=0.1396$

$f^{″}(0)=0.1396$

Third solution

$f^{″}(0)=0.1001$

$f^{″}(0)=0.1000$