An integral may have many primitives.
Why don't you differentiate the options to check if they yield the integrand.
Here's the basic question:
We have an integral, that of which we do not know, where two out of three students got the correct answer. Which two students are right?
My logic is that one of the is right, meaning the integral might be , but I'm not sure how one could get a out of that.
Any help is appreciated.
if the choices were the answers of the 3 students and only two got the correct answer, then student who didn't get it right might had written , like what kriz wrote, differentiate the three, since we don't really know what the integral was, at least, when the three were differentiated, 2 of them would yield the same derivative..