Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 59
ic computa-tion: 38. cotar + tana?. 43. 1-f tana? tan y. 39. cot a? — tan a?. 44. 1 — tan x tan y. 40. cota? + tany. 45. cota?coty+L 41. cot x — tan y. 46. cot a-cot y — 1.,p 1 — cos 2 a? »>r, tana?-f tan y 1 +cos 2 a? cot a? -f- cot y CHAPTER IV. THE OBLIQUE TRIANGLE. § 36. Law of Sines. Let A,… … In both figures, — = sin Ab In Fig. 30,In Fig. 31, h . D * - = sin B.a sin (180° —5) = sin B. Therefore, whether h lies within or without the triangle,we obtain, by division, a _ sin Ab sinB [25] THE OBLIQUE TRIANGLE. 51 By drawing perpendiculars from the vertices A and B tothe opposite sides we…
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