Leonhard Euler · 1748 · Internet Archive
Introductio in analysin infinitorum
All 320 leaves · leaf 217
Transcription
RECURRENTIBUS.
189
CAP.
XIII.
$B=+\frac{1}{4}$, unde fit terminus generalis $= (-\frac{1}{4} \sin \frac{1}{2} (n+1)\omega + \frac{1}{4} \sin \frac{1}{2} n\omega)z^n$. Quare colligendo erit terminus generalis quaesitus $= (\frac{3}{4}n + \frac{9}{8})z^n \pm \frac{1}{8}z^n - \frac{1}{4}(\sin \frac{1}{2}(n+1)\omega - \sin \frac{1}{2}n\omega)z^n$. Hinc
si fuerit
$n=4m+0$
$n=4m+1$
$n=4m+2$
$n=4m+3$
erit terminus generalis
$(\frac{3}{4}n+1)z^n$
$(\frac{3}{4}n+\frac{5}{4})z^n$
$(\frac{3}{4}n+\frac{3}{2})z^n$
$(\frac{3}{4}n+\frac{3}{4})z^n$
Ita, si $n=50$, valebit $n=4m+2$, eritque terminus $= 39250$.
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