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Proposition: Eveness of the Cosine of a Real Variable
The cosine of a real variable is an even function, i.e.
\[\cos(x)=\cos(x),\quad\quad x\in\mathbb R.\]
In particular, its graph is symmetric with respect to the \(y\)axis.
Table of Contents
Proofs: 1
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Examples: 1
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References
Bibliography
 Forster Otto: "Analysis 1, Differential und Integralrechnung einer Veränderlichen", Vieweg Studium, 1983