A trigonometrical identity.
Ewell, John A.
International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991), p. 815-816 / Harvested from The Electronic Library of Mathematics
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Publié le : 1991-01-01
DOI : https://doi.org/10.1155/S0161171291001102
EUDML-ID : urn:eudml:doc:46736 
@article{00038608,
     title = {A trigonometrical identity.},
     journal = {International Journal of Mathematics and Mathematical Sciences},
     volume = {14},
     year = {1991},
     pages = {815-816},
     doi = {10.1155/S0161171291001102},
     zbl = {0755.11032},
     language = {en},
     url = {http://dml.mathdoc.fr/item/00038608}
}

Ewell, John A. A trigonometrical identity.. International Journal of Mathematics and Mathematical Sciences, Tome 14 (1991) pp. 815-816. doi : 10.1155/S0161171291001102. http://gdmltest.u-ga.fr/item/00038608/