at 35:35 if we take derivative of the answer that is not going to be x^3(x^4+2). we need x^4 multiplied by (x^4+2)^6. Can anyone explain what is going on?####[['x^4', 'Mathematical_Related_Concept', 'NEU'], ['(x^4+2)^6', 'Mathematical_Related_Concept', 'NEU']]