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เนื้อหาย่อ : P R E F A C E we have been very pleased with the enthusiastic response to the sixth edition of Brief Calculus and Its Applications by teachers and stu- dents alike. The present work incorporates many of the suggestions they have put forward. Although there are many changes, we have preserved the approach and the flavor. Our goals remain the same: to begin the calculus as soon as possible; to present calculus in an intuitive yet intellectually satisfying way; and to illustrate the many applications of calculus to the biological, social, and management sciences. We have tried to achieve these goals while pay- ing close attention to students' real and potential problems in learning cal- culus. Our main concern, as always, is: Will it work for the students? Listed on the following pages are some of the features that illustrate various as- pects of this student-oriented approach. APPLICATIONS We provide realistic applications that illustrate the uses of calculus in other disciplines. The reader may survey the variety of applications by turning to the Index of Applications on the inside cover. Wherever possible, we have attempted to use applications to motivate the mathematics. EXAMPLES We have included many more worked examples than is customary. Furthermore, we have included computational details to enhance readability by students whose basic skills are weak. EXERCISES The exercises comprise about one-quarter of the text--the most important part of the text in our opinion. The exercises at the ends of the sections are usually arranged in the order in which the text proceeds, so that the homework assign-