Circular functions

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(Math.) See under Function.
See Inverse trigonometrical functions (below). - Continuous function, a quantity that has no interruption in the continuity of its real values, as the variable changes between any specified limits.

See also: Circular, Function

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He wrote the first accessible books on calculus, created the theory of circular functions, and worked on elliptic intervals, the calculus of variations, graph theory, and divergent series.

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