Difference between revisions of "Cosine"
From specialfunctionswiki
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| − | The cosine function is the unique solution of the second order initial value problem | + | The cosine function, $\cos \colon \mathbb{R} \rightarrow \mathbb{R}$ is the unique solution of the second order initial value problem |
$$y''=-y;y(0)=1.$$ | $$y''=-y;y(0)=1.$$ | ||
Revision as of 20:31, 2 October 2014
The cosine function, $\cos \colon \mathbb{R} \rightarrow \mathbb{R}$ is the unique solution of the second order initial value problem $$y=-y;y(0)=1.$$
