I was wondering what the answer to this question is. I just had a test and I want to make sure I was correct. So I need to find the derivative of $ \int_{x^6}^{0} \cos(\sqrt{t}) ~ dt $ (I believe it is $dt$ however I may be wrong and it could have been $dx$.)
The answer I thought was $-3x^2 \cos(x^3)$ but now I realize the answer might be $-6x^5 \cos(x^3)$. Thank you in advance!