This book has been specially written to the requirements of the students of all Indian University. Each chapter of this book contains complete theory and fairly large number of solve examples. Sufficient problems has also been selected from various universities examination papers. The author shall be gratefully to the readers who point out errors and omissions which in spite of all care might have been there. The author will feel amply rewarded if the book serve the purpose for which it is meant. Suggestions for the improvement of the book are always welcome. The subject matter has been discussed in such a simple way that the students will find no difficulty to understand it. The proofs of various theorems and examples has been given with minute details.