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April 16th, 2016, 04:35 AM   #1
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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.
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April 16th, 2016, 05:06 AM   #2
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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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