The Wronskian & Variation of Parameters · Medium problem

The Euler equation $t^2y''-3ty'+4y=0$ ($t>0$) has the repeated-root solution $y_1=t^2$; reduction of order gives a second solution $y_2=t^2\ln t$. Find the Wronskian $W(y_1,y_2)$ at the value of $t$ (other than $t=0$) where $y_2$ itself is zero.