Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 155
140 ANALYTIC GEOMETRY Substituting in sin^ d + cos- ^ = 1, there results af _ 2 sin (a - ;3 + co) _^ tf ^ sin-^ (a + ^ - w)^a^ ah Ir sin- w … tlie equation of an ellipse. 2. Find the envelope of a straight line which moves in such a mannerthat the sum of its intercepts on twointersecting straight lines is constant. Let - + - = 1 be the moving straighta bline, then must a-i- b = c, where c is aconstant. The equation of the straight line…
Geometry, Analytic
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