I'm trying to solve following ODE $$\frac{d^2y}{dx^2}+y\tan^{-1}(x)=0$$ But the power series of $\tan^{-1}(x)$ is actually divided in there regions here. Moreover, this ODE doesn't have the standard form as given in wikipedia.
I tried to do it in this post but it is not coming out to be useful.