1. The problem statement, all variables and given/known data y = 3*cube root 3√(x2-1) 2. Relevant equations Udu/dx + Vdv/dx (wrong as per below) Chain Rule now used 3. The attempt at a solution I have: Now y = 3*(x2-1)^1/3 let z=x2-1 y= 3(z)^1/3 dz/dx = 2x dy/dz = z^-2/3 = (x2-1)^-2/3 all = dy/dx = dz/dx * dy/dz = 2x*(x2-1)^-2/3 = 2x/(x2-1)^2/3 Instead I have an answer in my book: dy/dx = 3*1/3(x2-1)^-2/3 which in the end = (x2-1)^-2/3 I believe my answer is correct and it is a typing mistake, but I am not 100% sure. Thank you for any help in advance.