(a²+b²-1)-4a²b²因式分解

题无解,如为（a²+b²-1)²-4a²b²则有解看两个为独立整体.满足x^2-y^2=(x+y)(x-y)把相应的代进去,[(a²+b²-1)+(2ab)][(a²+b²-1)-(2ab)]=(a²+2ab+b²-1)(a²-...