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[Advanced Mathematics * Higher-order third derivative ~ ~ ~ ~ ~ Xianxia Elf enters! 】 the year of the sheep is full of joy!
1, the term whose power of x is less than n, $ TERM, is 0 in the process of derivation;

2. For the term where the power of x is equal to n, the power of x becomes 1 in the process of derivation, leaving only the coefficient;

3. If the power of x is greater than n, there is at least 1 after the derivative. After substituting x = 0, it is all 0.