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Find the limit. Use l'Hospital's Rule where appropriate. If there is a more elementary method, consider using it. If l'Hospital's Rule doesn't apply, explain why.
$ \displaystyle \lim_{x\to \infty} x\sin(\pi /x) $
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01:38
Wen Zheng
00:32
Amrita Bhasin
Calculus 1 / AB
Calculus 2 / BC
Chapter 4
Applications of Differentiation
Section 4
Indeterminate Forms and l'Hospital's Rule
Derivatives
Differentiation
Volume
Baylor University
University of Michigan - Ann Arbor
Boston College
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Find the limit. Use l'…
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Mhm. The first problem we're gonna be taking the limit as X goes to infinity of the following function. That's gonna be X. Sine of pi Uber X. So X sign of high over X is going to be our function. Okay? So when we substitute one over X for thi this is just gonna be pi T. And we know that as X goes to infinity to equal zero. So we can just change how we view the limit. So in this case now um this is gonna be a sign of pirate T over T. When T goes to zero now we have 0/0. That's an indeterminate form. So we'll take the uh derivative of the numerator. That'll be high co sign right? And this will just be one on the bottom. Then what will end up getting as a result is high time to co sign of zero which is one Over one. So our final answer will be high.
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