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Question

if xy+yz+ xz =1 then x+y/1-xy + y+z/1-yz + z+x/1-zx is equal to

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Solution

xy+yz+zx=11-xy = yz+zx1-yz =xy+zx1-zx=xy+yzand dividing by xyz we get 1x+1y+1z=1Let A = x+y1-xy+y+z1-yz+z+x1-zxNow putting values from above we get =x+y yz+zx+y+zxy+zx+z+xxy+yz=x+yxx+y+y+zyy+z+z+xzz+x=1x+1y+1z=1

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