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February 26th, 2009, 06:55 PM   #1
Joined: Feb 2009

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Calculating Arc Length

Hi, I have tried to do this problem for the last hour and Webassign is NOT liking my answer.

Find the length of the arc:


Here is what I got using the arc length formula:

I get for my answer:

which is the wrong answer.

I don't think I'm doing these correctly. Can someone go through the steps?
mollymcf2009 is offline  
February 27th, 2009, 06:29 PM   #2
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Re: Calculating Arc Length

Originally Posted by mollymcf2009

Nope. You can't get rid of square roots that easily.

Use this instead:

(There are no further complications, as cosh is positive for real arguments.)
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