 | Charles Davies - Surveying - 1830 - 390 pages
...subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remaii.der (39). 52. The secants and cosecants are omitted in the table, being easily found from the cosines and sines. Ra For, sec.= (37;; or, taking the logarithms: Iog.sec.=21og. cos. R — log. cos.=20 — log. cos;... | |
 | Robert Gibson - Surveying - 1833 - 436 pages
...angle, found by taking the corresponding degrees at the bottom of the page, and the minutes traced up in the right-hand column to the same horizontal...sec. = ; or, taking the logarithms, log. sec. = 2 log. R — log. cos. =20 — log. cos.; that is, the logarithmic secant is found by subtracting the... | |
 | Adrien Marie Legendre - Geometry - 1836 - 394 pages
...only to subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remainder. The secants and cosecants are omitted in the table, being easily found from the cosines and sines. R 2 For, sec. = ; or, taking the logarithms, log. sec.=i2 cos. log. R — log. cos. =20 — log. cos.... | |
 | Adrien Marie Legendre - Geometry - 1837 - 376 pages
...only to subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remainder. The secants and cosecants are omitted in the table,...sines. R2 For, sec.= ; or, taking the logarithms, log. sec.=2 cos. log. R — log. cos. =20 — -log. cos. ; that is, the logarithmic secant is found by substracling... | |
 | Adrien Marie Legendre - Geometry - 1838 - 372 pages
...only to subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remainder. The secants and cosecants are omitted in the table,...cos. ; that is, the logarithmic secant is found by substracting the logarithmic cosine from 20. And R3 cosec. = , or log. cosec.=2 log. R — log. sine... | |
 | Geometry - 1843 - 376 pages
...The secants and cosecants are omitted in the table, being easily found from the cosines and sines. D2 For, sec. = ; or, taking the logarithms, log. sec....cos. ; that is, the logarithmic secant is found by substracting the logarithmic cosine from 20. And R2 cosec. = , or log. cosec.=2 log. R — log. sine... | |
 | Charles Davies - Trigonometry - 1849 - 372 pages
...only to subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remainder. The secants and cosecants are omitted in the table, being easily found from the cosines and sines. For, sec. = ; or, taking the logarithms, log. sec.=2 • R 2 R* cos. log. R—log. cos.—20—log.... | |
 | Elias Loomis - Trigonometry - 1855 - 192 pages
...R—log. cosine =20—log. cosine. Ti' Also, cosecant = -—, sine or log. cosecant =20—log. sine. That is, The logarithmic secant is found by subtracting the logarithmic cosine from 20; and the logarithmic cosecant is found by subtracting the logarithmic sine from 20. Thtfs .we have found... | |
 | George Roberts Perkins - Geometry - 1856 - 460 pages
...A=20. Hence, log. sec. A = 20 —log. cos. A, log. cosec. A = 20 —log. sin. A. From this we see that The logarithmic secant is found by subtracting the logarithmic cosine from 20 ; and the logarithmic cosecant is found by subtracting the logarithmic sine from 20. EXAMPLES. <*.... | |
 | Elias Loomis - Logarithms - 1859 - 372 pages
...log. cosine =20— log. cosine. T>2 Also, cosecant = - — , sine or log. cosecant =20— log. sine. That is, The logarithmic secant is found by subtracting the logarithmic cosine from 20 ; and the logarithmic cosecant is found by subtracting the logarithmic sine from 20. Thus we have found... | |
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If the angle be greater than 90°, we have only to subtract it from 180°, and take the sine, cosine, tangent, or cotangent of the remainder. The secants and cosecants are omitted in the table, being easily found from the cosines and sines. 