Hyperbolic Cosine
The hyperbolic cosine is defined as
This function describes the shape of a hanging cable, known as the Catenary.See also Bipolar Coordinates, Bipolar Cylindrical Coordinates, Bispherical Coordinates, Catenary,Catenoid, Chi, Conical Function, Correlation Coefficient--Gaussian BivariateDistribution, Cosine, Cubic Equation, deMoivre's Identity, Elliptic Cylindrical Coordinates, Elsasser Function, FibonacciHyperbolic Cosine, Fibonacci Hyperbolic Sine, Hyperbolic Geometry, Hyperbolic Lemniscate Function,Hyperbolic Sine, Hyperbolic Secant, Hyperbolic Tangent, Inversive Distance, Laplace'sEquation--Bipolar Coordinates, Laplace's Equation--BisphericalCoordinates, Laplace's Equation--Toroidal Coordinates, Lemniscate Function, Lorentz Group, Mathieu Differential Equation,Mehler's Bessel Function Formula, Mercator Projection, Modified Bessel Function of the First Kind,Oblate Spheroidal Coordinates, Prolate Spheroidal Coordinates, Pseudosphere, Ramanujan Cos/CoshIdentity, Sine-Gordon Equation, Surface of Revolution, Toroidal Coordinates
References
Abramowitz, M. and Stegun, C. A. (Eds.). ``Hyperbolic Functions.'' §4.5 in Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 9th printing. New York: Dover, pp. 83-86, 1972. Spanier, J. and Oldham, K. B. ``The Hyperbolic Sine 
and Cosine 
Functions.'' Ch. 28 in An Atlas of Functions. Washington, DC: Hemisphere, pp. 263-271, 1987.
- Disymmetric
- Ditrigonal Dodecadodecahedron
- Ditrigonal Dodecahedron
- Divergence
- Divergenceless Field
- Divergence Tests
- Divergence Theorem
- Divergent Sequence
- Divergent Series
- Diversity Condition
- Divide
- Divided Difference
- Divine Proportion
- Divisibility Tests
- Divisible
- Division
- Division Algebra
- Division Lemma
- Division Ring
- Divisor
- Divisor Function
- Divisor Theory
- Dixon-Ferrar Formula
- Dixon's Factorization Method
- Dixon's Random Squares Factorization Method