Category:Lagrange's Cosine Identity
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This category contains pages concerning Lagrange's Cosine Identity:
| \(\ds \frac 1 2 + \sum_{k \mathop = 1}^n \map \cos {k x}\) | \(=\) | \(\ds \frac 1 2 + \cos x + \cos 2 x + \cos 3 x + \cdots + \cos n x\) | ||||||||||||
| \(\ds \) | \(=\) | \(\ds \frac {\map \sin {\paren {2 n + 1} x / 2} } {2 \map \sin {x / 2} }\) |
where $x$ is not an integer multiple of $2 \pi$.
Pages in category "Lagrange's Cosine Identity"
This category contains only the following page.