Hey,

I've been struggling with this tute question,

I really don't understand where im supposed to be going,

I've been trying to show the u derivatives are zero because the hint says to do that,

So far ive just been messing around with

f(z) = u + iy, |f(z)|=u^2+y^2 =k

then i took d/dx partial derivative

2u(du/dx) + 2v(dv/dx) = 0 all partial derivatives

Now im stuck plugging in C-R equations trying to find a way to show du/dx and du/dy are zero,

I don't really understand what to do after that also,

Thanks in advanced,