The book A Treatise On Plane And Spherical Trigonometry was written by author William Chauvenet Here you can read free online of A Treatise On Plane And Spherical Trigonometry book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is A Treatise On Plane And Spherical Trigonometry a good or bad book?
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Trig. (154) and (109) is reduced to tan* (45o - } A) = ^-£=3 (104) % v * ; tan*( c +«) l ' which will give a more accurate result than (89), when A is nearly 90°. 61. From (91) we find 1 — cos b cos a — cos e 1 _J_ cos b cos a + cos e or tan* J 6 = tan J (c + a) tan £ (c — a) (105) which may be employed instead of (91) when b is small, or nearly 180°. 62. From (90) we find 1 — cos B tan c — tan a 1 + cos B tan c + tan a t an'ji ?= 8 | n j f - a > (106) 2 sin (c + a) l ' which may be employed in...stead of (90) when B is small, or nearly 180°. 63. By similar transformations the formulae (101), (102) and (103) become . • * — cos (A 4- B) ,„ __ % tan* i e = ) A J\ ( 107 ) d cos (.4 — B) l ' tan* } a = tan [J (4 + i?) — 45°] tan [45° + £ {A — i?)] (108) tan* i b = tan [J (4 + 5) — 45°] tan [45° — J (4 — 5)] (109) We have also, by (14), . . , — cos (A 4- B) — cos C sin* } e = . ' , . — s * 2 sin A sin i? which, when C = 90°, becomes ... — cos (A +B) /1im Sin* h C = ;r— .
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