haha, keta haru ni... DWI, ooh maan...yah i also figured later that it wasnt correct..suxxx and i agree on what you said... kiwi bro, u got the answer ..hurray!! username, i dont know what u did...arent we proving 2+2 = 22, not 88 = 88...khoi i must be lost.. btw, here's logarithmic differentiation problem, can anyone help me with it.. y = (x^2x(x-1)^3)/(3+5x)^4