
Marc D. answered 12/02/20
Engaging and patient Master of Applied Mathematics.
Unless there is a typo, the question is a trick!
Regardless of the first 2 integrals, the integral of any function on the interval [a,a] where a = a is zero. There is no area under a point.
Check:
Say f(x) = 1
Integral of 1 from [10 ,10] with respect to x is:
[x]1010 = 10 - 10 = 0.
Feel free to plug in any other function and find the same result. Definite integrals need to have a valid interval in the subject variable to have a solution not equal zero.