Let $\displaystyle y_1 and y_2 $ be nontrivial solutions of y'' - p(x)y=0. Suppose $\displaystyle W= $$\displaystyle \left(\begin{array}{cc}y_1&y_2\\y'_1&y'_2\end{arra y}\right) $ is the Wronskian of $\displaystyle y_1 and y_2$. Show that W is a constant.

Do I need to find W'????