cosine at multiples of straight angle

Everybody remembers the cosine values


The thing can be concisely expressed as the


for each integer n.  The values of sine at the same angles are simply 0.

Title cosine at multiples of straight angle
Canonical name CosineAtMultiplesOfStraightAngle
Date of creation 2013-03-22 15:45:40
Last modified on 2013-03-22 15:45:40
Owner pahio (2872)
Last modified by pahio (2872)
Numerical id 6
Author pahio (2872)
Entry type Definition
Classification msc 26A09
Related topic multiple
Related topic ComplexSineAndCosine
Related topic HigherOrderDerivativesOfSineAndCosine
Related topic FourierSineAndCosineSeries
Related topic GeneralAssociativity
Related topic ValueOfRiemannZetaFunctionAtS4
Related topic ValueOfDirichletEtaFunctionAtS2