| Andrew Wheeler Phillips, Wendell Melville Strong - Trigonometry - 1926 - 332 pages
...stated : I. The sine of the middle part is equal to the product of the tangents of the adjacent parts. **II. The sine of the middle part is equal to the product of the cosines of the** opposite parts. 84:. In the right spherical triangles considered in this work, each side is taken less... | |
| Howard Whitley Eves - History - 1983 - 292 pages
...noncontiguous parts the opposite parts. Napier's rules may be stated as follows: 1. The sine of any **middle part is equal to the product of the cosines of the two opposite parts.** 2. The sine of any middle part is equal to the product of the tangents of the two adjacent parts. (a)... | |
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