Solution
= Solution
With $y=z/x^2$ the equation becomes $z\prime\prime+z=0$. Thus $y_1=\cos x/x^2$, $y_2=\sin x/x^2$, and $W(y_1,y_2)=x^{-4}\ne0$.
= Solution
With $y=z/x^2$ the equation becomes $z\prime\prime+z=0$. Thus $y_1=\cos x/x^2$, $y_2=\sin x/x^2$, and $W(y_1,y_2)=x^{-4}\ne0$.