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

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Now I know a value (certainly do!) Number, whose use gives circular functions; Purpose, numerical, too ...
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.
This one is a bit surprising and very interesting for students to discuss--hence the name "circular functions"!

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