log(x + 1) log(x + 2) log(x) log(x + 2) log(x + 1) log(x) ---------- + ---------- + ---------- >= ---------- + ---------- + ---------- log(x) log(x + 1) log(x + 2) log(x) log(x + 2) log(x + 1)
log(x + 2)/log(x + 1) + log(x + 1)/log(x) + log(x)/log(x + 2) >= log(x + 1)/log(x + 2) + log(x + 2)/log(x) + log(x)/log(x + 1)