Gager, William A.
Contemporary college algebra and trigonometry
Macmillan, 1968
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Gibilisco, Stan, 1953-
Trigonometry demystified
McGraw-Hill, 2012
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Hackert, Adelbert F.
Elements of trigonometry
D.C. Health, 1971
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Dwyer, David
College algebra and trigonometry : a contemporary approach
Brooks/Cole, 2000
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Harmon, Frank L.
Modern college trigonometry
Dickenson, 1996
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