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INVERSE CIRCULAR FUNCTIONS, HYPERBOLIC FUNCTIONS AND INVERSE HYPERBOLIC FUNCTIONS
1963C. PLUMPTON, W.A. TOMKYS
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Trigonometric and Inverse Trigonometric Functions. Hyperbolic and Inverse Hyperbolic Functions
1994If 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).
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