Mathematics for engineering students, Analytical geometry and calculus (1907)
Keller, S. S. (Samuel Smith), 1867-1923, Knox, W. F., [from old catalog] joint author · New York : D. Van Nostrand company · leaf 73
cos ((9 - 0)= r2[since cos2 6 + sin2 6 = i and cos O cos 0r+ sin 0 sin d= cos (6 - 0)\ TANGENTS AND NORMALS. Art. 45. To find the equation of a tangent to thecircle x2 + y2 = r2. Since a line may be determined bytwo conditions, and a tangent must be perpendicular to aradius and touch the circle at… … Fig. 26. and taking these two points on the circle, we are able toconvert this condition in the special case of the tangentinto the point of tangency and the distance from the origin.The equation of a line through two points (#, /) and(*,/) is, ?-/=£f^(*-*) • • • (B) Analytical Geometry. 65 Let…
Geometry, Analytic · Calculus
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