Решить преобразуйте выражение в многочлен (x+y+z)(x+y-z) (x-y+z)(x-y-z) (x-y+z)(x+y+z)

(x+y+z)(x+y-z)=X²+xy-xz+yx+y²-yz+zx+zy-z²=X²+Y²-Z²+2XY
(x-y+z)(x-y-z)=X²-yx-zx-yx-y²+zy+zx-zy-z²=X²+Y²-Z²-2YX
(x-y+z)(x+y+z)=X²+XY+XZ-YX-Y²-YZ+ZX+ZY+Z²=X²-Y²+Z²+2ZX