This book is prepared in accordance with the latest syllabus for 3rd Semester B. Tech. Course (Common for all branches) of University of Calicut, Kerala. This book is based on the experience and notes while taking classes for B. Tech. students for more than 14 years. This book consists of three Units. First Unit covers topics of both I and II Modules, Second Unit covers topics of IV Module and Third Unit that of III Module. Solved University Questions of previous years have been included in each unit, to let the students understand the various skills necessary to solve the problems. More university questions with answers have also been included in each unit for practice. Intimations of errors and suggestions for improvement will be highly appreciated and gratefully acknowledged.