Question

if u=x+y/1−xyandv=tan −1 x+tan −1 y Show that δ(u,v)/δ(x,y)=0

Answer 1

\[u=x+y/1-xy and v=\tan ^{-1}x+\tan ^{-1}y show that \delta(u,v)/\delta9x,y0=0\]