\\y1(x)=\frac{\sin{x}}{\sqrt{x}},
\\y2(x)=\frac{\cos{x}}{\sqrt{x}},
\\W(y1,y2)=\begin{vmatrix}
y1(x) & y2(x) & y \\ 
y1'(x) & y2'(x) & y'(x) \\ 
y1''(x)& y2''(x) & y''(x)
\end{vmatrix}=0