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If |alpha|,|beta| lt 1, s (1) =1- alpha ...

If `|alpha|,|beta| lt 1, s _(1) =1- alpha +alpha^(2) -alpha^(3)+…oo and s_(2)=1-beta +beta ^(2) -beta ^(3)+…oo` then
`(1-alpha beta +alpha^(2) beta ^(2) -alpha ^(3) beta ^(3) +…oo)` is equal to

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