Geodesic
On cosine and sine functional equations
Annales Polonici Mathematici, Tome 20 (1968) no. 3, pp. 245-249

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Pl. Kannappan. On cosine and sine functional equations. Annales Polonici Mathematici, Tome 20 (1968) no. 3, pp. 245-249. doi: 10.4064/ap-20-3-245-249
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