En enkel trigonometrisk formel. (Q1445673)
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scientific article; zbMATH DE number 2583072
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | En enkel trigonometrisk formel. |
scientific article; zbMATH DE number 2583072 |
Statements
En enkel trigonometrisk formel. (English)
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1927
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Geometrischer Beweis für die Formel \[ \frac{\sin 3\alpha}{\sin \alpha}-\frac{\cos 3\alpha}{\cos \alpha}=2. \]
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