y= [ (2x-a)(a-x)^2]^(1/3)lny = (1/3)[ln(2x-a) + 2ln(a-x) ](1/y)y' = (1/3)[2/(2x-a) - 2/(a-x) ]y' =(1/3)[2/(2x-a) - 2/(a-x) ] .[ (2x-a)(a-x)^2]^(1/3)