It's no use reciting without it. First of all, you should understand the formulas and deduce the relationship of each formula clearly. There is a certain correlation between the formulas. You must find out the relationship between the formulas. Over time, you will naturally remember all the formulas, but the backrest is useless. If you don't understand it thoroughly, even if you recite it, you won't be able to use it or do the problem.

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