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[TEX]\red y=\frac{1}{ax+b} [/TEX]
- [TEX]y'= -1. a . ( ax+ b)^{-2} [/TEX]
- [TEX]y" = -1. (-2) . a^2 . (ax+ b)^{-3} [/TEX]
- [TEX]y^{(n)} = \frac{(-1)^n . n! .a^n }{(ax+b)^{n+1}}[/TEX]
Áp dụng với a=b=1:
ta được [TEX]y^{(n)} = \frac{(-1)^n . n!}{(x+1)^{n+1}}[/TEX]