If u=f(x, y) where x=(e^s)(cos(t)) and y=(e^s)(sin( show that (du/dx)^2 + (du/dy)^2 = (e^(-/ds)^2+(du/dt)^2))

no usually the problem is set up this way f(x,y)= z if z= w/e ( it has an x and a y) where y= (something that has s and t) and x= ( something that has s and t) but your question does not make sense to me. Are you sure you wrote it right?

answer: plz put a pic in so i can answer it

step-by-step explanation: