Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 92
Example. —Plot r = aO. e = -4: -3 -2 -1 0 r = — 4a — 3 a — 2 a — a 0 12 3 4a 2 a 3 a 4 a The curve is calledthe spiral of Archimedes.In rectangular coordi-nates the equation ofthis spiral is transcen-dental. … Example. — Plot r = $ = 0 cos-> f r = —2 T 00 3 — T) cos 6 ±cx> 78 ANALYTIC GEOMETIIY From 6 = 0 to 6 = cos~^ f, r varies continuovisly from — 2 to — cc ; from ^ = cos~^f to0 = TT, r decreases contimi-ously from + co to -{- -h ;from 6 = Tr to 6 = cos~^ | inthe fonrtli qxiadrant, r in-creases…
Geometry, Analytic
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