Elements of analytical geometry and the differential and integral calculus (1856)
Robinson, Horatio N. (Horatio Nelson), 1806-1867 · Cincinnati : J. Ernst · leaf 35
, b sm. n—a cos. m sm. n—a cos. m 26 ANALYTICAL GEOMETRY. Polar, €o-ordioates. When a ]ine is conceived to revolve round a point, that pointis called a fole, and any other point in such a line referred toco-ordinates, is denominated the system of polar co-ordinates. Conceive the line AB to… … Now from the first of these we have cos.v (v may re- volve all the way round the pole), and as x and cos.v are bothpositive and both negative at the same time, that is, both posi-tive in the first and fourth quadrants, and both negative in thesecond and third quadrants, therefore r will always be…
Geometry, Analytic · Calculus
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