Question

If xy=1 then proved that (1+x+y^-1)^-1 + (1+x+y^-1)^-1 + (1+x+y^-1)^-1=1

Answer 1

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Answer 2

(1+1+1-1)-1(1+1+1-1)-1=1
(2)(-1-1-1+1)-1=1
(2)(-3+1)-1=1
(2)(-2)-1=1
(-4)-1=1
+4=1


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