"If "x=1+a+a^(2)+...oo,|a|lt1,y=1+b+b^(2...

`"If "x=1+a+a^(2)+...oo,|a|lt1,y=1+b+b^(2)+...oo,|b|lt1,"then prove that ":(xy)/(x+y-1)=1+ab+a^(2)b^(2)+...oo`

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