8 + 3u LO) du vu 9. DETAILS SCALCET9 5.4.037.0/1 Submissions Used Evaluate the definite integral. 1/3 (7 sec?(y)) dy J/6 10. DETAILS SCALCET9 5.5.001. 0/1 Submissions Used Evaluate the integral by making the given substitution. (Use C for the constant of integration.) cos(7x) dx, u = 7x