Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 92
shall have TD=^x- x^—A 84 ANALYTICAL GEOMETRY. PROPOSITIO]!^ V. To find the equation of a normal to ike hyperbola. Let a be the trigonometrical tangent of tlie line TP, (see lastfigure,) and a the trigonometrical tangent to the line PN. Thenif PNis a normal, it must be at right angles to PT, and…
Geometry, Analytic · Calculus
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