Appendix B Trigonometric Identities

Dedicated to Professor S. Kurepa on the occasion of his 73rd birthday. We are familiar with many trigonometric formulas (identities)leading to five more identitiesand so on, where #x211D; is the set of reals.

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Lattices of Trigonometric Identities

College Mathematics Journal ◽

10.1080/07468342.1989.11973237 ◽

1989 ◽

Vol 20 (3) ◽

pp. 232-234

Author(s):

William E. Rosenthal

Keyword(s):

Trigonometric Identities

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Some new sums of q-trigonometric and related functions through a theta product of Jacobi

International Journal of Number Theory ◽

10.1142/s1793042120500931 ◽

2020 ◽

Vol 16 (08) ◽

pp. 1803-1817

Author(s):

Mohamed El Bachraoui ◽

József Sándor

Keyword(s):

Product Formula ◽

Infinite Sums ◽

Trigonometric Identities

We evaluate some finite and infinite sums involving [Formula: see text]-trigonometric and [Formula: see text]-digamma functions. Upon letting [Formula: see text] approach [Formula: see text], one obtains corresponding sums for the classical trigonometric and the digamma functions. Our key argument is a theta product formula of Jacobi and Gosper’s [Formula: see text]-trigonometric identities.

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A Decision Method for Trigonometric Identities

Mathematics Magazine ◽

10.2307/3029765 ◽

1953 ◽

Vol 27 (2) ◽

pp. 75

Author(s):

Eliot Chamberlin ◽

James Wolf

Keyword(s):

Decision Method ◽

Trigonometric Identities

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