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Published online by Cambridge University Press: 17 January 2013
The most simple and obvious use of the Trigonomentrical Tables, is to find the logarithmic sine, tangent, &c. corresponding to a given angle; and, reversely, the angle corresponding to a given sine or tangent. However, in their more general application, we have often to find a logarithmic cosine, having given the corresponding sine, or the contrary; also the sine or cosine from a given tangent, and, in these cases, it may be of no consequence to know the exact angle.
page 148 note * Cagnoli Trigonometrie, Art. 428, 2de Edition.
page 152 note * The symbol —Δlog cos x here indicates, that the sign of log x—log (x+Δx), (which is a negative quantity), is to be changed to +.