Swokowski, Earl William.
Fundamentals of trigonometry / Earl W. Swokowski. - 7th ed. - Boston : PWS-Kent, c1989. - x, 355, 60 p. : ill. - The Prindle, Weber and Schmidt series in mathematics. . - Prindle, Weber & Schmidt series in mathematics. .
0534917305
92014077
Plane trigonometry
Fundamentals of trigonometry / Earl W. Swokowski. - 7th ed. - Boston : PWS-Kent, c1989. - x, 355, 60 p. : ill. - The Prindle, Weber and Schmidt series in mathematics. . - Prindle, Weber & Schmidt series in mathematics. .
0534917305
92014077
Plane trigonometry