Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 40
resulting angle is the same as when x and y are bothacute. SECTION XXVII FUNCTIONS OF A NEGATIVE ANGLE If the angle x is generated by the radius moving from theinitial position OA to the terminal position OS, it will have thesign —, and its terminal side willbe identical with its position forthe… … EXERCISE Xm 1. Express sin 250° in terms of the functions of an acuteangle less than 45°. Solution, sin 250° = sin (270° - 20°) = - cos 20°. Express the following functions in terms of the functionsof angles less than 45° : 2. sin 172°. 5. cot 91°. 8. sin 204°. 3. cos 100°. 6. sec 110°. 9. cos…
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