1. The problem statement, all variables and given/known data Find dy/dx of y=1/xlnx 2. Relevant equations I thought that I'd have to use the quotient rule: y'=vu'-uv'/v^2 However the differential of 1 is 0, so is this the right rule to use? 3. The attempt at a solution u=1 u'=0 v=xlnx v'=1/x y'=vu'-uv'/v^2 y'=(xlnx*0)-(1*1/x)/(xlnx)^2 y'=-1/x(xlnx)^2 y'= -1/x^3lnx^2 But this doesnt seem right to me, I'm not sure. Any help at all would be greatly appreciated. Many Thanks.