A Treatise On the Differential And Integral Calculus And On the Calculus of Va
A Treatise On the Differential And Integral Calculus And On the Calculus of Va
Edward Henry Courtenay
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Prop. To determine the evolute of a given curve y = Fx. If in the formulce for the co-ordinates of the centre of the oscu- latory circle, viz. : (Art. 127. ) ■P , l+;/2 (1) and h 1 -4- »'2 2J p we substitute the values of p' and jo", derived from the equation of the curve y = Fx (3), we shall have the three equations (1), (2), and (. T), involving the four variable quantities . R, y, «, and i; and by eliiiiiiiating x and y the result will be a general relation between G and 6, the co-ordinates ...of the required evolute. This equation being independent of x and y will apply to every point in the desired curve. io8. In most cases the necessary elimina- tion is quite difficult; the following are com panuivoly simple examples. ]. '^llie evolute of the common parabola. Here we have y^ _ o^;^: .... (1). V p^ p' -'-, and p" = -^. y yo EVOLUTES AND INVOLUTES. 177 y y^ p' P y1 . P2 y y — 2 - y y6 ■ (3). From (2) and (3) we get x =. — ;-, — 5 and y"^ = p h ; and these values substituted in (1) give 3 7# l^ b 2/-^^' '■- = ^A'^-i>Y' the equation of the semi-cubieal parabohi, whose axis coincides with that of the given curve ; the distance Aa between the vertices being =z p the semi-parameter.
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