1. The problem statement, all variables and given/known data differentiate: yx = y / sqrt(x2 + y2) 2. Relevant equations 3. The attempt at a solution I solved this problem by taking the ln of both sides and then solving. It seems from the context of the problem set that this was supposed to be easier than that. Am I missing a simple shortcut to the solution or did I do it the only way that is possible?