Hello, I need to change some triple integrals from Cartesian coordinates to cylindrical coordinates. I understand the geometry used to derive the equations for doing so, but I have a question about the Jacobian. We need to adjust by the absolute value of the determinant of the Jacobian to evaluate the transformed integral. My professor's notes are a bit spotty, so I have been trying to teach myself from the internet. At this wikipedia link (http://en.wikipedia.org/wiki/List_o...ransformations#From_cylindrical_coordinates_2) It gives me the Jacobian for moving FROM Cartesian TO cylindrical coordinates. However, this link (http://www.math24.net/triple-integrals-in-cylindrical-coordinates.html) gives a different Jacobian for converting FROM Cartesian TO cylindrical coordinates. Which one is correct?