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I need a book for mathematics which would explain me every concept s theory in detail. It should have some solved examples and then exercises covering all types of questions. But the theory part is very important for me. I ve got ML Khanna and A das gupta objective& And I don t find the theory to be sufficient& So please suggest me a good book. For instance I am having great difficulty in understanding modulus inequalities& So plz suggest an apt. Book which would give me the theory