Hey everybody, first time poster although i've recently come across this forum and it's helped me discover the solution of many problems ive been having. I've seen to come to grips with most partial derivative problems i've come across, however, i still cant get correct solutions to problems involving quotients, dont know how exactly to go about it. The two specific questions ive got in my book which i cant seem to get are given below. 1. The problem statement, all variables and given/known data Evaluate the first partial derivative 2. Relevant equations f(x, y) = (x + y)/(x - y) (1) f(x, y) = log(1+x) / log(1+y) (2) Thanks for any help which could be given =) I assume you use the standard quotient rule, but i dont know how exactly to go about it with multiple variables...thanks.