 | Charles Hutton - Geometry - 1826 - 682 pages
...all its generality, we soon deduce from the equationi marked i in that problem, the following ; viz. cos a — cos 6 . cos c cos A = sin b . sin c cos b — cos a . cost cos B = cos c = sin a . sin c cos c— cos a . cos t. sin a . sin 6 As these... | |
 | Levi Leonard Conant - Trigonometry - 1909 - 320 pages
...— = - i - '- -- 5 - * • 2 sin b sin c .. In like manner, 2 v sin 6 sin c 1 . A _ sin 6 sin c — cos 6 cos c + cos a sin b sin c 1 + cos A _ cos a — cos (6 + c) 2 2 sin 6 sin c . a + b + c . b + e — a sin — • - ' — sin — ! sin... | |
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ABC, the three equations ; cos a = cos 6 cos c + cos A sin b sin c 1 cos b = cos a cos c -j- cos B sin a sin c > .... (B). 