Barrow, Isaac, Lectiones opticae & geometricae : in quibus phaenomenon opticorum genuinae rationes investigantur, ac exponuntur: et generalia curvarum linearum symptomata declarantur

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Item, quoniam ang. RNE ipſi XQE par haud minor eſt recto,
erit
RE &
gt; RN. quare MR + RE & gt; MR + RN. hoc eſt
ME
&
gt; MR + RN. Eſt autem (ex _Arcbimedæis_ aſſumptis) MR
+ RN &
gt; arc. MN. ergò magìs eſt ME & gt; arc. MN
VI. Perutilis eſt hæc propoſitio in _tangentium demonſtra@ionibus_
_expediendis_
.
Etenim hinc couſectatur, ſi arcus MN indefinitè par-
vus
ponatur, ejuſce loco alterutram tangentis particulam ME, vel
NH
tutò ſubſtitui.
_Speciminis_ hîc loco _metbodum proponam generalem cycloidum om-_
_nium
, &
conſimili modo deſcriptarum curvarum tangentes determi-_
_nandi_
, hinc petitâ demonſtratione munitam.

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