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I was in an Engineering program and I have moved to a Physics one, and I want to retake calculus to really get good at it.

The problem is, Spivak's seems to me like it's very proof based, and I'm having a hard time even with the first problems with elemental numbers and basic proofs. Even when I give up and look them up online, they don't make sense to me, as in why should someone even need to prove that a/b * c/d = (ab)/(cd)

Should I keep going with this book or maybe you know something more appropiate for a physics student?

To be honest I just need a reason to keep going through this book, because I would love to get a deeper understanding of calculus.