Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 95
the tangent line, and in which,y and x are the general co-ordinates of its points. Sub-tangent. 15. A SUB-TANGENT is the projection of the tangent onthe axis of abscissas, or on the axis of ordinates; that is, 9^ ANALYTICAL GEOMETEY. [bOOK 111. it is the part of either axis, from the point of… … which is the line OT. If from CT, we subtractCHy which is designatedhj x, we shall have the sub-tangent, x x 2. This expression for the sub-tangent TR^ is independentof the conjugate axis, and will, therefore, be the same forall ellipses having the same transverse axis AB^ and thepoints of tangency…
Geometry, Analytic · Calculus
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