Use the Chain Rule $to$ evaluate the partial derivative $\frac{\text{d}\text{e}\text{l}\text{g}}{\text{d}\text{e}\text{l}\text{u}}at$ the point $(u,v)=(0,3),$ where $g(x,y)=x^2-y^2,x=e^{3u}cos(v),$

$y=e^{3u}sin(v).$

$(Use$ symbolic notation and fractions where needed.$)$

$\frac{\text{d}\text{e}\text{l}\text{g}}{\text{d}\text{e}\text{l}\text{u}}{|}_{(u,v)}=$