| The trigonometrical formula to use is known, but once again, we are deceived by our perceptions. |
| He also made important contributions to spherical trigonometry, particularly by reducing the number of equations used to express trigonometrical relationships from 10 to 2 general statements. |
| The appendix contains tables of information pertaining to weights of bars and flats, conversion factors, and trigonometrical expressions. |
| It is perhaps surprising that the second most important trigonometrical function during the period we have discussed was the versed sine, a function now hardly used at all. |
| Ingham, Some trigonometrical inequalities with applications to the theory of series, Math. |
| Basic calculations, trigonometrical functions and various special functions simplify even comprehensive evaluations. |
