The Elements of the Differential Calculus Comprehending the General Theory of
The Elements of the Differential Calculus Comprehending the General Theory of
J R John Radford Young
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) Normals to the curve are tangents to the evolute. Let the equations of the curve and of its evolute be y = Fx and /3 = fa, then differentiating the equation (2) p. 131, considering a, ^ as va- riables as well as x, y, we have but (130) ^ + p"(^-/3)+p'^-p'^=^0, Hence, by substitution, ax ax df3 da d^ 1 /5 — v, . -. -f-— ^or-f- = r=- ^fequa. 2, p. 131). dx, dx da p a — a? "^ ' Now -J— expresses the trigonometrical tangent of the angle be- tween the axis of a; and a linear tangent through any po...int (a, (3) of the evolute, and expresses the trigonometrical tangent of the P angle between the axis of x and a normal at any point {x, y) of the involute ; but this normal necessarily passes through a point (a, fS) of the evolute, and, therefore, in consequence of the above equality, it must coincide with thq tangent at that point. THEOREM. (103. ) The difference of any two radii of curvature is equal to the arc of the evolute comprehended between them. Differentiating the equation % » 14^ THE DIFFERENTIAL CALCULUS.
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