If x,y,zx, y, zx,y,z are in geometric progression, what is the value of (x+y+z)(x−y+z)(x+y+z)(x-y+z)(x+y+z)(x−y+z)?
x2+y2+z2x^2+y^2+z^2x2+y2+z2
x2+xy+z2x^2+xy+z^2x2+xy+z2
x2+xz+z2x^2+xz+z^2x2+xz+z2
x2−xz+z2x^2-xz+z^2x2−xz+z2