Elements of Plane And Spherical Trigonometry: With the First Principles of ...
Elements of Plane And Spherical Trigonometry: With the First Principles of ...
James B James Bates Thomson
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by any of the formulas, (88), (89), (90). To exemplify this, let, us supply the radius in the first of these, and we shall obtain . _^ /sm(s — 6)sin(s — c)r^ sm^ArrV — ^^ /, ."^ ^— ; -* smosmc or, as it may be expressed, sini A=v \ -r-rr.-: — .sin(5 — b) sin(5— «) l. ^ (sin6smc v ^ v >'j By taking the logarithms of both members of this, we find (No. 50) logsiniA=iJ10 — ^logsmft-f-l^ — logsinc+logsm(a — 6)-|-logsin(s— )JJ(122) In a similar manner, we find, from (89) and (90), log cos JA=i [ 10— ...log sin 6-|-10 —log sin c + log sma + log sin(5 — a) J ...... ( 123) logtaniA=:iJlO— Iog8in5-|-10— logsin(5— a)-|-log«in(s— 6)-|-logsin(s — c)J(134) This last formula,: expressed in words, gives the following theorem : 1. Add the three sides together, and take half the sum. 2. Fromi After readii]^ what is ffiven in section V. regarding the areas of spherical triangles, the student wiu see, that the principles here explained wiU illus- trate Llhulllier's.
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