Question 1 1 pts In Video 25d we discussed examples of the "u-sub". According to the example 4 there, in order to take the integral one has to make the following substitution: Ou=e Ou=eva Ou=vi Ou=1 O none of the above Question 2 1 pts In Video 25e, in the first example, we compute the integral sec x de; what substitution do we make? O u = sec c Ou = tan's O u = secc + tanc Ou = secr + tan'x O none of the aboveQuestion 3 1 pts dx In Video 25e, in order to take the integral f m, the following substitution is made: T (also double check why we do that substitution, and what we get at the end as an answer, it is a trig function!) O u==x Ou=