Drooyan, Irving.
Essentials of trigonometry / Irving Drooyan, Walter Hadel, Charles C. Carico. - 2d ed. - New York : Macmillan, c1977. - viii, 328 p. : ill.
"A portion of this material has been adapted from Trigonometry: an analytical approach."
0023302208
75030627 //r93
Plane trigonometry.
Essentials of trigonometry / Irving Drooyan, Walter Hadel, Charles C. Carico. - 2d ed. - New York : Macmillan, c1977. - viii, 328 p. : ill.
"A portion of this material has been adapted from Trigonometry: an analytical approach."
0023302208
75030627 //r93
Plane trigonometry.