April 16th, 2016, 04:35 AM  #1 
Newbie Joined: Oct 2012 Posts: 29 Thanks: 0  Wrong integration?
Here's the solution presented: https://gyazo.com/fed030974b17823cec72c0e07a726ad9 In the last line, shouldn't it be $\displaystyle \frac{1}{0.8}\cos(\frac{x}{0.8})$ and not $\displaystyle 0.8\cos(\frac{x}{0.8})$? Last edited by skipjack; April 16th, 2016 at 04:49 AM. 
April 16th, 2016, 05:06 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 21,027 Thanks: 2258 
No, as the derivative of $0.8\cos(\frac{\Large x}{\large0.8})$ is $\sin(\frac{\Large x}{\large0.8})$, as required.


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