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1895 Sur une Généralisation de la formule $\frac{\varphi }{2} = \frac{{\sin \varphi }}{1} - \frac{{\sin 2\varphi }}{2} + \frac{{\sin 3\varphi }}{3}. . .$
Carl Störmer
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Acta Math. 19: 341-350 (1895). DOI: 10.1007/BF02402880
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Vol.19 • 1895
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