1. The problem statement, all variables and given/known data I'm doing a physics lab and need to do the uncertainties, and the method I'm using is the natural log method, hich goes like this: (equation used was k*(x^a)*(y^b)*(z^c) ) http://img297.imageshack.us/img297/3663/lnform.jpg [Broken] The equation I'm doing: http://img175.imageshack.us/img175/4214/40303282.jpg [Broken] I'm just wondering how it simplifies (the right most part of the first picture) so that I can take the partial dervs. (The Inside of ln is my actualy equation, calorimetry.) 2. Relevant equations I don't know, otherwise I would apply them! 3. The attempt at a solution It's a pretty straight foward problem, once I see it down once I think I can do it all the time in the future. The main problem I am having is dealing with the things in the denominator. Thanks!