Geodesic
Some trigonometric identities involving Fibonacci and Lucas numbers
Journal of integer sequences, Tome 12 (2009) no. 8
In this paper, using the number of spanning trees in some classes of graphs, we prove the identities:
Classification : 11B39, 05C05, 15A18
Keywords: Fibonacci numbers, Lucas numbers, spanning tree, trigonometric identity 
@article{JIS_2009__12_8_a3,
     author = {Bibak,  Kh. and Shirdareh Haghighi,  M.H.},
     title = {Some trigonometric identities involving {Fibonacci} and {Lucas} numbers},
     journal = {Journal of integer sequences},
     year = {2009},
     volume = {12},
     number = {8},
     zbl = {1201.11023},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JIS_2009__12_8_a3/}
}
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Bibak,  Kh.; Shirdareh Haghighi,  M.H. Some trigonometric identities involving Fibonacci and Lucas numbers. Journal of integer sequences, Tome 12 (2009) no. 8. http://geodesic.mathdoc.fr/item/JIS_2009__12_8_a3/