1. The problem statement, all variables and given/known data Two charges one located at P at the position (x,y,z) and P' at the position (x',y',z') Let f= 1/R. Calculate Fx= partial derivative of f with respect to x. Calculate Fx'= partial derivative of f with respect to x'. There are sub question involving the same thing with other variables but if you could help me figure out the first part that should go easy. 3. The attempt at a solution I solved R to be = (x-x')i + (y-y')j + (z-z')k... i think thats right but I do not know how to go about finding the partial derivatives of f. I have never really worked with vectors let alone inverse vectors with calculus.