(x-1)/(x2+1)*(x4-1)/[(x-1)2]*(x2-1)/(x4-2x2+1)
(x-1)(x4-1)(x2-1)/(x2+1)(x-1)(x-1)(x2+1)(x2+1)
(x-1)(x4-1)(x2-1)/(x2+1)(x-1)(x-1)(x2+1)(x2+1)
(x4-1)(x2-1)/(x2+1)(x-1)(x2+1)(x2+1)
Not sure if this is right and where to go from here, please help! Answer by romenoodle(1) (Show Source):