Cohen, David <br/><br/>
Precalculus with unit-circle trigonometry / 
 Precalculus with unit-circle trigonometry  [electronic resource] 
David Cohen, with Theodore B. Lee, David Sklar 
 - 4th ed. 
 - Belmont, CA :  Thomson Brooks/Cole,  c2006 
 - 1 v. (various pagings) :  ill. (some col.) ;  27 cm. +  1 CD-ROM 
<br/><br/><label>ISBN: </label>0534402305 (text) 9780534402303 (text) 0534402399 (CD-ROM) 9780534402396 (CD-ROM) 0534253377 (iLrn tutorial) 
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