Check out this interesting comic riddle from Spikedmath.com! The sky is the limit when it comes to Math!

Do give it a try, before scrolling down to view the answer.

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**Answer: sky
**

First, we use L’Hopital’s Rule since the initial limit is a 0/0 indeterminate form.

(We have also used the product rule and chain rule in this step)

Substituting x=k into the expression, we get which is equivalent to .