Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 278
e radius OA ; they are thu8designated: sin AB for BD cos AB for OD tan AB for A C sec AB for OC 12. If ABE be equal to a quadrant, or 90°, then EBwill be the complement of AB. Let the lines ET and IBbe drawn perpendicular to OE. Then, ET, the tangent of EB. is called the cotangent of AB;IB, the… … PLANE TRIGONOMETRY. 278 13. If we take an arc, ABEF,greater than 90°, its sine will beFII; OH will be its cosine; AQits tangent, and OQ its secant.But FlI is tlie sine of the arc GF^which is the supplement of AF^and Oil is its cosine: hence, thesine of an arc is equal to the sine ofits supplement;…
Geometry · Trigonometry
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