Plane trigonometry, and its application to mensuration and land surveying. Accompanied with all the necessary logarithmic and trigonometric tables (1852)
Perkins, George R. (George Roberts), 1812-1876 · New York, D. Appleton · leaf 19
s. a. tang, (—a)—— tang. a\ cotan. (—$)=—cotan. a. sec. (—«)=sec. a\ cosec. (—a)=— cosec. a. §13. If the arc KC is equal to thearc BC, then will the arc BC be thesupplement (§ 7) of the arc BO. De-noting the arc BC by a, we have ob-viously the following relations: 4 sin. 0=sin. (180°—a); cos. a= —… … 0° 90° 180° 270° 360° same as 0° Sine . . 0 + 1 0 -1 0 Cosine . +1 0 -1 0 + 1 Tangent . 0 GO 0 GO 0 Cotangent go 0 GO 0 GO Secant . +1 GO -1 GO -1 Cosecant go + 1 00 -1 GO §15-] TRIGONOMETRY. In general, if n denote any integral number, including alsothe value of n=0, we shall have, : sin. 180° =…
Plane trigonometry · Surveying
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-45-25.webp)
