1994 | OriginalPaper | Chapter
Trigonometric and Inverse Trigonometric Functions. Hyperbolic and Inverse Hyperbolic Functions
Author : Václav Vilhelm
Published in: Survey of Applicable Mathematics
Publisher: Springer Netherlands
Included in: Professional Book Archive
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If theoretical problems are under consideration, angles are not measured in degrees, but in radians (circular measure): The magnitude of an angle α is given by the length l of the arc, intercepted by the arms of the angle α on the unit circle with centre at the vertex of the angle (Fig. 2.1). We shall denote the magnitude of the angle α in circular measure again by α; sometimes, instead of α, the notation arc α° is employed, α° denoting the magnitude of the angle α expressed in degrees (in the sexagesimal system).