Secant
The function defined by 
, where 
is the Cosine. The Maclaurin Series of thesecant is
where
is an Euler Number.See also Alternating Permutation, Cosecant, Cosine, Euler Number, Exsecant, Inverse Secant
References
Abramowitz, M. and Stegun, C. A. (Eds.). ``Circular Functions.'' §4.3 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, pp. 71-79, 1972. Spanier, J. and Oldham, K. B. ``The Secant 
and Cosecant 
Functions.'' Ch. 33 in An Atlas of Functions. Washington, DC: Hemisphere, pp. 311-318, 1987.
- Epimenides Paradox
- Epimorphism
- Epispiral
- Epispiral Inverse Curve
- Epitrochoid
- Epitrochoid Evolute
- Epsilon
- Epsilon-Neighborhood
- Epstein Zeta Function
- Equal
- Equal by Definition
- Equal Detour Point
- Equality
- Equally Likely Outcomes Distribution
- Equal Parallelians Point
- Equiaffinity
- Equiangular Spiral
- Equianharmonic Case
- Equi-Brocard Center
- Equichordal Point
- Equichordal Problem
- Equidecomposable
- Equidistance Postulate
- Equidistant Cylindrical Projection
- Equidistributed Sequence