Hey, In my class we just learned about logarithmic differentiation. I can see this being useful when taking the derivative of a complex function since it could be messy. But, I tried it on simpler equations as well. Everything I tried it on it seemed to work. Are there ever instances that it does not work? To make sure we are using the same definition of logarithmic differentiation, I simply mean taking the log of both sides of an equation before taking its derivative. So where: y = x2 ln y = ln (x2) 1 / y * y' = 1 / x2 * 2x y' = 2y / x y' = 2x Certainly just taking the derivative of this is easier, but it's just an example.