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f(X)=x^3+x+1 inverse f ?

 Jan 6, 2019
edited by Guest  Jan 6, 2019
 #1
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Mmm - beats me how to do it manually though. 

 

https://www.wolframalpha.com/input/?i=inverse+of+y%3Dx%5E3%2Bx%2B1

 Jan 6, 2019
 #2
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S=1/1+1/2+1/3+...+1/n

 

S(n) ?

 Jan 6, 2019

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