[微分] 高階微分
f(x)=(3x-7)^2*(2x^4+5x^3-3x+4)^3
(3x-7的平方乘上(2x^4+5x^3-3x+4)的三次方)
f(14)(2)=???
(f(x)微14次代x=2 )
找不到它的規性 硬微會變成一長串式子
答案是 72*14! (72乘上14階乘)
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