The book Engineering Mathematics-III is primarily written for the students of B.Tech. second year of all Engineering Institutions and other technical universities. The present book, therefore, has been written keeping in view the syllabus prescribed by various technical universities. The requirement of the students have been a major factor kept in mind in preparing the book. In every chapter concepts and techniques have been discussed in detail, keeping in view the beginners may not find any difficulty in grasping the subject matter. It has been written in systematic manner and contains large number of solved and unsolved problems.