A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 366
passes from 0 to + oo. J» 90° the ordinate (tangent) in both ■¥ and —, i. «., ± oo. So also at270°, and at other similar points. A similar device illustrates the changes in the other trigono-metrical functions. Some may see the propriety of distinguishing oo as -h and —, who, never-theless, do not… … Fig. 8. u PLANE TRIGONOMETRY. 42. ScH. The results of the preceding discussion of the signs and limits ofUie tiigonometrical functions, 24 to 41, are exhibited in the annexed -1^ the Limits.Between At the Limits.Between W3 At the Limits.Between 1 o+3 + + tH + 2 + o+ +2 + + +2 + + S 1 - £ + 2 3 + +…
Geometry · Trigonometry
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