Newcomb, Simon, 1835-1909 · New York, H. Holt and company · leaf 200
e conjugate hyperbola referred totlie same axes is X _ f Tangent and Normal to an Hyperbola. 167. Problem. To find the equation of the tangent toan hyperbola. In order to obtain the equation of the tangent, we haveonly to repeat the process of §§ 134, 135, changing b^ into b\ Thus we get or xx bxx… … from which we see that x and x must always have the same sign; and since x is always positive in the right branch of the curve, the tangent to that branch always intersects the axis of X to the right of the centre. 168. Subtangent. Foj- the length of the subtangent weliave, from the figure,…
Geometry, Analytic
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