Google Books

Lobachevsky's book, are the following: sin a sin B = sin b sin A, cos A sin b sin c - cos A - cos b cos c, cot A sin C = cos C cos b - cot a sin b, cos a sin B sin C = cos A - cos B cos C.

Leerboek der rechtlijnige en bolvormige dreihoeksmeting - Page 115
by Rehuel Lobatto - 1877 - 180 pages
Full view - About this book

Principles of geometry, mensuration, trigonometry, land-surveying, and ...

Thomas Tate (mathematical master.) - 1848 - 284 pages

...Dividing this equation by sin a; substituting -; — for sm A sin c -. — ; and reducing, we find, sin a cot a . sin b = cos 6 . cos c + cot A . sin c ... (5). Dividing eq. (4) by sin a ; substituting by eq. (3) ; and multiplying by sin A, we find, cos...

Full view - About this book