Find the Jacobian $\frac{\text{d}\text{e}\text{l}(x,y)}{\text{d}\text{e}\text{l}(u,v)}$ for the transformations $x=3$ucos$(2v),y=3$usin$(2v)$ and $x=3$usin$(2v),y=3$ucos$(2v).$

The Jacobian for $x=3$ucos$(2v),y=3$usin$(2v)is$