The book An Elementary Treatise On Analytical Geometry was written by author Francis H Smith Here you can read free online of An Elementary Treatise On Analytical Geometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Elementary Treatise On Analytical Geometry a good or bad book?
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y — y" = a {x — x") ; it is required to determine a. For this purpose, let the tangent be regarded as a secant, and let us determine the co-ordinates of the points of inter- section. These co-ordinates must satisfy the three preceding equations, since the points to which they belong are common to the line and circle. Combining these equations, by sub- tracting the second from the first, we have y^ — y"^ -\' ^^ - — ^"^ — 0, or {y — y") {y + y") + {x -^ x") {x + x") = o. Putting for y, its value ...y" + « (a; — x") drawn from the equation of the Hne, we get \2ay" + «2 (^ __ ^//) _|_ ^ + x"\ (x — x") = o. This equation will give the two values of a; corresponding to the two points of intersection. The co-ordinates of one point are obtained by putting s — x" = 0, which, gives X =^ a;", and y — y" ; and those of the second point are made known by the equation 2aij" ■\- a" {x — x") ■\- x ■\- x" = o, when a is given. If now we suppose the points of intersection to approach each other, the secant line will become a tangent, when those points coincide ; but this supposition makes X = x"y and y = y" ; Chap.
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