cosine at multiples of straight angle


Everybody remembers the cosine values

cos0=1,cos(±π)=-1,cos(±2π)=1,cos(±3π)=-1,

The thing can be concisely expressed as the

cosnπ=(-1)n

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