Hello, I require some assistance with this problem. It reads: If, u=1/2x^3; v=3(u+u^2); w=1/v^2; Find dw/dx. It's clear that you should use the chain rule so I begin by calculating the derivative for each one. I get v^(-2); 6u+3; and 3/2x^2. I then have to multiply them but this is where the problem comes. The answer I derived was (3x^(2)-12u-6)/2v^3 This doesn't seem right and the answer say it isn't at the back of book. Is the problem the multiplication?