Some Trigonometric Inequalities.
Elemente der Mathematik, Tome 27 (1972), pp. 121-128.

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@article{ELMA_1972__27_141078,
     author = {J. Steinig},
     title = {Some {Trigonometric} {Inequalities.}},
     journal = {Elemente der Mathematik},
     pages = {121--128},
     publisher = {mathdoc},
     volume = {27},
     year = {1972},
     zbl = {0266.50007},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1972__27_141078/}
}
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J. Steinig. Some Trigonometric Inequalities.. Elemente der Mathematik, Tome 27 (1972), pp. 121-128. http://geodesic.mathdoc.fr/item/ELMA_1972__27_141078/