Calculus college problem

[MightyMate]

Hey there, I got 3e as an answer, I don't understand what's the write formula to get 1, Thanks in advance for the help

I used this formula but didn't work https://en.wikipedia.org/wiki/Leibniz_integral_rule

 

[Deleted member 4993]

Hey there, I got 3e as an answer, I don't understand what's the write formula to get 1, Thanks in advance for the help

I used this formula but didn't work https://en.wikipedia.org/wiki/Leibniz_integral_rule

View attachment 31956

Can you please share your work, step-by-step, using Liebniz integral rule?

 

[MightyMate]

Can you please share your work, step-by-step, using Liebniz integral rule?

View attachment 31957

I just realized that the integral is by x which is not related to s and t, so if I'm understanding correctly, the formula doesn't work here.
In my answer I got zero from the 2nd subtraction and 3rd addition so it left me with the first part, but now I see that it's incorrect.

 

[MightyMate]

Thank you for your time, apparently my answer was right so the lecturer gave me back the point