Is there a systematic way to do it? In particular, I have the coordinates ##x=au \sin v \cos w##, ##y=bu\sin v\sin w##, ##z=cu\cos v##, where a, b, c are constants, and I want to find ##u(x,y,z)##, ##v(x,y,z)##, ##w(x,y,z)##. I could solve the three equations for u, v, and w and then try to...