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Secant is a term in mathematics derived from the Latin secare ("to cut"). It may refer to:
- a common term for radius
- a secant line, in geometry
- the secant variety, in algebraic geometry
- the secant method, a root-finding algorithm in numerical analysis, based on secant lines to graphs of functions
- the trigonometric function, reciprocal to the cosine
- a secant ogive in nose cone design
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