Heres the problem and the issue i need help with circled in red:
Im trying to figure out how exactly you are supposed to calculate du. I see that i take the derivative of u, but im unsure how to go about it from there on. Im having the same issue in other problems and some clarification would be much help. Thanks.
Dear Evan.Kimia,
From the definition of differentials,
Refer:Elementary Calculus: Definition of Differentials
Hope this will help you.
thank you both, i realized i just didnt notice that they simplified it.
I did have another question related to solving for dx for another problem:
when solving for dx this is my method:
would this calculation be correct? Because if it is, im not sure how to continue from here.
It is better to confirm that the OP has the correct expression for dx and then let him/her continue with the question rather than posting virtually the rest of the solution. However, there is more left to do than meets the eye - because there is an error in your work which I would prefer ws not pointed out (leave something more for the OP to do).