find G (x)

Question

                   x

Given G(x)=∫ln(2t+1)dt  find G '(x).  
                  1
2x+1
ln(2x + 1) - ln3
ln(2t + 1) + C
2/2x+1

Answer 1

I think that the answer is just ln(2x + 1)  [no constant afterwards]