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I have multiple calculus textbooks, problem-solving books, and How to Prove It by Velleman. At the moment, I am considering reading various proofs in my calc textbooks and then doing more proof-based problems to see how I have improved OR read through How to Prove It. I don't think How to Prove It comes with a solution manual, so I guess the question is, should I go with a direct approach by looking at proofs or a more "formal" training in proof-writing? Any suggestions, especially ones that I haven't suggested, are welcome.