1. The problem statement, all variables and given/known data Hello, I have this function z(x,y) = sin(2*x)*cos(2*y)*e-(x^2+y^2)/6 I need to find an equation of any curve line that lies on that z(x,y) function. 2. Relevant equations 3. The attempt at a solution Sorry, I really have no idea how to proceed on this, been looking on my note book and google and have not find anything.