1. S2, 23 15 + 24 da = [? " du, after doing the substitution given by u = 15 + x4. O True O False 2. Evaluate the definite integral using the substitution u = cos(x). / - tan(x) dx = O -3 Oo O In(2) O - In(3) + 1 O In (2)6. Given that fo f (2x) da = 2, which of the following must be true? Off (r) dr = 2 O - 258 f (r) dr = 4 O the f (r ) dr = 1 O 2 fy f (r) dr = 1 O - 2/8 f (r) dr = 2 7. S3 823 Using the substitution y = x4, which of the following is equivalent to the above integral? O 858 ey dy Off ey dy O 32 6: 3 ev dy O ofjev dy O 2 frey dy