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Do you know LH rule ?? Where you can differentiate the numerator and denominator.

sorry I keep messing up the latex and openstudy is so slow.

and yeah I know lh rule could be applied since \(k\in\mathbb{R}\). But how does that help?

Okay since it is (-1) , LH rule won't be applied.

I need to show it though to show that a series is convergent.

hmm, Am not too comfortable with that.
@phi