下列因式分解正确的是( )
A.x2+y2=(x+y)(x+y) | B.x2-y2=(x+y)(x-y) |
C.-x2+y2=(-x+y)(-x-y) | D.-x2-y2=-(x+y)(x-y) |
A.x2+y2=(x+y)(x+y) | B.x2-y2=(x+y)(x-y) |
C.-x2+y2=(-x+y)(-x-y) | D.-x2-y2=-(x+y)(x-y) |