1. The problem statement The problem requires me to calculate the flux of F=x^2 i + z j + y k out of the closed cone, x=sqrt(y^2 + z^2) with x between 0 and 1. I am having trouble approaching this problem because most of the problems I have done give the curve as z=f(x,y) instead of x=f(y,z) and I am therefore confused as to how to apply the below equation. 2. Relevant equations For the flux through a surface given by z=f(x,y) Flux = int(F . dA) = int( [ F(x,y, f(x,y)) dot (-df/dx i - df/dy j + k) ]dxdy where df/dx is the partial derivative of f with respect to x and df/dy is the partial derivative of f with respect to y. How can I modify/apply this formula (if I even can) when given a surface as a function of x=f(y,z) as opposed to z=f(x,y) to find the flux through the horizontally opening cone? Any help would be greatly appreciated! Thanks so much. 3. The attempt at a solution I tried putting f in terms of z and going that route but ran into some nasty integrals. I tried replacing z with x and x with z (for F and f) as to simulate the same vector field and cone in a way that better applied to the given formula but once again ran into some nasty integrals. Suggestions?