A Course of Mathematics, Vol. 2 Of 2: For the Use of Academies As Well As Private Tuition (Classic Reprint)

Excerpt from A Course of Mathematics, Vol. 2 of 2: For the Use of Academies as Well as Private Tuition

But. In every plane triangle, the sum of the three angles is two right angles therefore a and c are equal to the supple ment of A and, consequently, since an angle and its supple ment have the same sine (cor. L, pa. 378, vol. I), we have sin. (n +c) sin. 8 cos. C+ sin c. Cos I.

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