| Benjamin Martin - Plane trigonometry - 1736 - 414 pages
...PROPOSITION III. As the Sine of half the Sum of the two Angles, is to the Sine of half the Difference ; ío is the Tangent of half the contained Side, to the...Tangent of half the Difference of the other two Sides. PROPOSITION IV. As the Co-fine of half the Sum of the Angles, is to the Co-fine of half the Difference... | |
| James Atkinson - Navigation - 1770 - 514 pages
...two Angles ; is to the Sine of half their Difference j So So is the Tangent of half their interjacent Side, to the Tangent of half the Difference of the other two Sides : Again, Secondly^ As the Sine Complement of half the Sum of two Angles, is to the Sine Complement... | |
| William Mountaine - Astronomical instruments - 1778 - 128 pages
...Angles given,-' • is to the Sine of half their Difference ; fo is the Tangent of half the interjacent Side, to the Tangent of half the Difference of the other two Sides. ' Secondly, As the Sine Complement of half the Surn of the two given- Angles, is to the Sine Complement... | |
| Mathematics - 1801 - 658 pages
...difference of the other side?. THEOREM VII. As the cosine of half the sum of two angles Is to the cosine of half the difference, So is the tangent of half the contained side To the tangent of half the sum of the other sides; These four Theorems may be applied not only to the second and fourth cases,... | |
| Samuel Webber - Mathematics - 1808 - 520 pages
...the other angles. THEOREM VI. As the sine of half the sum of two angles Is to the sine of half their difference, So is the tangent of half the contained...To the tangent of half the difference of the other sides. •f THEOREM vii. • *••t. % ' As the cosine of half the sum of two angles Is to the cosine... | |
| Francis Nichols - Plane trigonometry - 1811 - 162 pages
...any two angles is to the sine of half their difference, as the tangent of half the included side is to the tangent of half the difference of the other two sides: also, the cosine of half the sum of any two angles is to the cosine of half their difference, as the... | |
| Benjamin Peirce - Spherical trigonometry - 1836 - 92 pages
...of half their difference, as the tangent of half the side to (749) which they are both adjacent is to the tangent of half the difference of the other two sides ; that is, in the spherical triangle ABC (figs. 4. and 5.), 33 sin. J (A + C) : siiu b(A—C) (750)... | |
| Benjamin Peirce - Spherical trigonometry - 1836 - 84 pages
...to the sine of half their difference, as the tangent of half the side to they are both adjacent is to the tangent of half the difference of the other two sides ; that is, in the spherical triangle ABC (figs. 4. and 5.), sin. J (A + C) : sin. i (A — C) (760)... | |
| Benjamin Peirce - Plane trigonometry - 1845 - 498 pages
...difference, as the tangent of half the side to which Napier's Analogies. they are both adjacent is to the tangent of half the difference of the other two sides ; that is, ill the spherical triangle ABC (figs. 32 and 33), ua.%(A-{-C) : sm.$(A— C)=tang.J6 : tang... | |
| Benjamin Peirce - Plane trigonometry - 1845 - 498 pages
...difference, as the tangent of half the side to which Napier's Analogies. they are both adjacent is to the tangent of half the difference of the other two sides ; that is, in the spherical triangle ABC (figs. 32 and 33), : sin. £(A— C)=tang.£& : tang £ (a—... | |
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