Integrate 1/x^3 with Riemann integration. Help.

Puffy

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Feb 25, 2018
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I been trying to solve this integral 1/x^3 in the closed range [1,2] using riemann integration (using limits) but without success. Sorry if this is so simple but im new on calculus.
How can I integrate this using riemann..

This is the point where I dont know what to do, what should I do next?..

. . . . .\(\displaystyle \dfrac{1}{n}\, \cdot\, \dfrac{1}{\left(1\, +\, \dfrac{3i}{n}\, +\, \dfrac{3i^2}{n^2}\, +\, \dfrac{i^3}{n^3}\right)}\)

Im thinking that maybe this is not integrable by the rienmann method, as I say I dont know cause im new on calculus. For my mental health please help me guys.
 

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