First off, I must say I truly enjoy these forums, though I tend to shy away from Calculus. Calculus and I just don't seem to get along, which is strange since I really enjoy other forms of math. On to the questions. Note, these 3 are the ones I just can not seem to work through on an assignment for my 3rd Semester in a technology course. I may be working in the right direction here, but I don't feel like I am. Any help would be appreciated. Question 1, using implicit differentiation only x[ln(y)]=sin(x+y) and the other x[e^y]=tan^-1(xy) I have tried several attempts at solving these but I seem to get stuck with dy/dx on both sides and no apparent way to solve for them. Any help, even if only the starting step or two, would be most appreciated!