Solve Q8: 8. If xy+yx+zx=1, then expression x + y 1 - x y + y + z 1 - y z + z + x 1 - z x is equal to. A 1 x + y + z B 1 x y z C x + y + z D x y z Share with your friends Share 0 Varun Rawat answered this We have, xy + yz + zx = 1⇒xy + yz = 1 - zx⇒yx + z = 1-zx⇒z + x1 - zx = 1yAgain,xy + yz + zx = 1⇒yz + zx = 1-xy⇒zx+y = 1-xy⇒x+y1-xy = 1zSimilarly, we gety + z1 - yz = 1xNow, x+y1-xy + y + z1 - yz + z + x1 - zx=1z + 1x + 1y=xy + yz + zxxyz=1xyz 0 View Full Answer