मान लीजिए कि x=1+a+a^(2)+... ओर y=1+...

मान लीजिए कि `x=1+a+a^(2)+... ` ओर `y=1+b+b^(2)+..., ` जहाँ ` |a|lt 1` ओर `|b|lt1` है । सिद्ध कीजिए कि
`1+ab+a^(2)b^(2)+...=(xy)/(x+y-1)`

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