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Euler gives a continued fraction representation of (1+x)^n involving
1,3,5,7,... and n^2-1,n^2-4,n^3-9,... and squares of z, for x=2y and y=z/(1-z).
He evaluates this continued fraction at z=t sqrt(-1), for ``vanishing'' n, and
for infinite n.
Comments 7 pages, seems to be first English translation of Latin original
``Commentatio in fractionem continuam, qua illustris La Grange potestates
binomiales expressit'', Memoires de l'academie des sciences de
St.-Petersbourg 6 (1818), 3-11, E750