Друзья! Помогите проинтегрировать

Int (1/x * (1-x) (1+x) dx) = int (1/x * 1/2 (1 / (1-x) + 1 / (1+x))) = 1/2int ((1/x * (1-x) + 1/x * (x+1)) dx) = 1/2int ((1/x+1 / (1-x) + 1/x - 1 / (x+1)) * dx) =

1/2int (2/x+1 / (1-x) - 1 / (1+x)) = 2ln (x) - ln (1-x) - ln (1+x) + c