Leonhard Euler · 1744 · Internet Archive
Methodus inveniendi lineas curvas
All 336 leaves · leaf 173
Transcription
166 DE USU METHODI
betur $Blf d. \frac{p}{\sqrt{(1+pp)}} = dx$, & integrando $x+b = \frac{Bplf}{\sqrt{(1+pp)}}$
$= \frac{cp}{\sqrt{(1+pp)}}$, posito $Blf = c$. Habetur ergo $p = \frac{b+x}{\sqrt{(cc-(b+x)^2)}}$ & $y = b \pm \sqrt{(c^2 - (b+x)^2)}$. Erit
igitur $f = b + \sqrt{(c^2 - (b+a)^2)}$, posito $x=a$, atque
$B = \int y dx = ba + \int dx \sqrt{(c^2 - (b+x)^2)}$, posito post
integrationem $x=a$. Facto igitur $Blf=c$, innotescet va-
lor $a$, cui si $x$ aequalis capiatur in Circulo radii $c$, portio abscin-
detur Problemati satisfaciens. Caeterum ex his & Coroll. 5
colligere licet, quoties formula maximi minimive fuerit functio
quaecunque binarum harum formularum $\int y dx$ & $\int dx \sqrt{(1+pp)}$,
curvam satisfacientem perpetuo esse Circulum: tantum ex solu-
tione quantitas portionis satisfacient
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