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I have a masters in physics but it is decades old and I am a little rusty. Plus, I didn't study calculus and differential equations carefully or systematically, as I was young and arrogant (not to say that all young people are arrogant, but I was). Returning to physics now, I find that I can get through advanced derivations, but the process is slow and painful as I am not as strong on the fundamentals as I should be. Plus, I feel I am handicapped helping others in this Forum. So I am looking for a textbook, or online resource, that will help me refresh and solidify my skills. It should include integrals of trigonometric functions and also ordinary differential equations. There should be problems and examples. Any recommendations would be appreciated.