Pignani, Tullio J.
Elements of trigonometry
Harcourt, Brace, and World, 1968
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Gibilisco, Stan, 1953-
Trigonometry demystified
McGraw-Hill, 2012
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Taylor, Howard E.
Contemporary trigonometry
McGraw-Hill, 1973
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Harmon, Frank L.
Modern college trigonometry
Dickenson, 1996
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Nanney, J. Louis
Trigonometry : a skills approach, lecture version
Allyn and Bacon, 1980
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