y log x 2+1, y x y log x /log 2, let f x log x2-2x, y log2 x+1, y log x+1, log2 x/y, y log2 x+2, log x - log 2 1, log x 2+y 2, log x 1/2, y log1/2x, log2 1/x+1, log2 x 1/2
let y log 1-x2/1 x2. There are any references about let y log 1-x2/1 x2 in here. you can look below.