Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 167
(4) cot A cot 5. (3)(2) The Gauss Equations. … cos £(A -f -#) cos ^c = cos l (a -f- 5) sin J Csin \ (A + -5) cos \ c = cos |- (a — 6) cos £ Ccos l( J. — B) sin i c = sin %(a + b) sin -§- (7.sin \{A — B)sin|c— sin J (a — 6) cos £ (7. Rule I. sin in (I.) gives — in (3), and conversely,cos in (I.) gives -f- in (3), and conversely. Rule II.…
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