Abstract
Translated from the Latin original, Öbservationes generales circa series,
quarum termini secundum sinus vel cosinus angulorum multiplorum progrediuntur"
(1777). E655 in the Enestrom index. Euler looks at the binomial expansion
\$(1+x)^n\$ for \$x=\phi+i\sin\phi\$. He does \$n=\$ positive and negative
integers, and \$n=1/2, -1/2\$, and particular values of \$\phi\$.
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