(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

http://prikachi.com/images/26/4273026B.gif

2. Relevant equations

3. The attempt at a solution

I'm having problems in solving the limit which is shown on the gif file .

As you see I use L'Hopital's rule 2 times and I get to a point when I should divide -sinx with sinx which results in -1 instead of 1 which is the right answer according to the key.

P.S sorry for posting the same thread in another sub-forum before I came here.

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# Limits with sinx where x tends to infinity help.

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