Question

Do I just substitute... ?

Answer 1

\[\int\limits_{0}^{2x} \frac{ t+\sin(t) }{ 4+\ln(3t) }\]

Find the dy/dx

Answer 2

I believe that this is the Fundamental Theorem of Calc I?
So yes, you just plug it in.

Answer 3

... but there has to be something else..

Answer 4

don't forget to multiply by the derivative of the upper limit ....

Answer 5

FToC requires you have an x as ur upper limit. Which you hae.
Just take the deriv of the upper limit and multiply.