I did sub it in as a replacement for $\sqrt{x}$ though.
I posted this elsewhere since I wasn't even sure if it would be approved here. There it was suggested that I should have put $4cos\theta=\frac{1}{\sqrt{x}}dx$
This is an important conceptual point, though. Are you saying that this is the...
I have a few questions and a request for an explanation.
I worked this problem for a quite a while last night. I posted it here.
https://math.stackexchange.com/questions/3547225/help-with-trig-sub-integral/3547229#3547229
The original problem is in the top left. Sorry that the negative...