Hello! This is a question from one of our past exams, and it's had me stumped for the past hour. The question states: The cylinder [tex]x^2+y^2=2x[/tex] cuts out a portion of a surface S from the upper nappe of the cone [tex]x^2+y^2=z^2[/tex]. Compute the surface integral: [tex]\int\int (x^4-y^4+y^2z^2-z^2x^2+1) dS[/tex] I'm mainly having trouble getting started. What exactly is the surface that we're supposed to evaluate the integral over? My guess on this question is that I should parametrize the cone: [tex]T(u,v) = (vcosu, vsinu, v)[/tex] And use that to find [tex]T_u X T_v[/tex]. But what do I do after this? In order to find the limits of integration for u and v, do I use the conditions given by the cylinder? [tex]v = 2cosu[/tex]? Using that still doesn't give me the numerica limits for v, though. Help, anyone?