It can be shown that $y_1=2$ and $y_2=co{s}^2(9x)+si{n}^2(9x)$ are solutions to the differential equation $9x^{5}sin(2x)D^{2}y-2x^{2}cos(9x)Dy=0$ on $(0,\frac{}{4}).$

What does the Wronskian of $y_1,y_2$ equal on $(0,\frac{}{4})?$

$W(y_1,y_2)=$ on $(0,\frac{}{4}).$

$1.$ Is $\{y_1,y_2\}$ a fundamental set for $9x^{5}sin(2x)D^{2}y-2x^{2}cos(9x)Dy=0$ on $(0,\frac{}{4})?$