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""What, Where, When, Why and How of Mathematics Class 12" is altogether a new approach for practicing and revising Mathematics for Class 12 CBSE Board exams. The book covers solutions to the questions that appeared in the 2008 - 2015 solved papers of CBSE Board Delhi, All India and Foreign (including their compartment papers) papers. The book provides a unique and innovative chapterisation and has been divided on the basis of the types of the questions rather than the typical chapter format. Some of the typical chapter names are: Check Your Knowledge of Concepts; Formula based questions; Check your understanding of concepts; Simplifying the problem; How to prove the problems mathematically; Application Based short-word problems; Application based long word problems; Application based (value based) problems etc. The name of the book follows from the answers it provides to the following 5 questions: 1. What has been asked in the exam? 2. Why is this question important? Why this question is repeated many-a-times? 3. How do I answer this question in the best way? 4. Where (Delhi/AI/Foreign) did this question appeared? 5. When (year) was this question asked? The book also provides 3 Sample papers with detailed solutions. The papers have been designed on the latest pattern of the exam as announced by the CBSE. The book will be an eye-opener for all class 12 students who will appear in the CBSE board examination."