Precalculus : a problems-oriented approach 
Cohen, David. 
 - Fourth edition. 
 -  West Publishing Company.  1993 
 - ix, 971 pages 
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<br/><br/><label>ISBN: </label>0-314-02299-6 
<br/><br/><label>Dewey Class. No.: </label>512.1 C6781 1993