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The present book is designed for the first year engineering students.||About the Author: Dr. N.H.Ayachit is presently Professor of Physics and Associate Dean (Academic) at BVB College of Engineering and Technology, Hubli, Karnataka he has a teaching experience of more than 25 years. He is actively engaged in research activity from the last 30 years and his interested in the fields of spectroscopy, antenna, DSP and Education research.P.K. Mittal is presently Dean Research and Development, Graphic Era University, Dehradun (Uttarakhand). He has been teaching post-graduate and under- graduate classes since last 43 years. He has been guiding research students and 15 students have obtained Ph.D. under his guidance. He has been honored by Ramanujan Mathematical Society and felicitated by then Minister of Higher Education, Government of Uttar Pradesh, for his services.