u=20. lowing inde 13. 8r cos +1)* dx, u = x² + 1 8x cos (4x2 + 3) dx, u = 4x² + 3 14. 15. sin' ro 3x cos x dx, u = sin x (6x + 1)√3x² + xdx, u = 3x² + x 17-32. Indefinite integrals Use a change of variables to find the fo lowing indefinite integrals. Check your work by differentiating. ntegral is 16. 7/4 Exercises 53-60 etation. To keep 1) dx. The graph [0,2] is shown area is given by +1, du = 2 dx, 17. (2x(x²-1) dx 18. √xe² dx (√x + 1)4 dx 20. 19. dx 2√x 21. 2r2 - 4x³ (x² + x)10 (2x + 1) dx 22. √x³(x² + 16)° dx 23. 25. S dx 27. (x6-3x²)* (x³- x) dx 10x - dx 3 sin 100 cos e de 24. Jsino 26. √x² x10 dx (Hint: Let u=x-2.) sin x 10 dx 28. uon grand y = is given by the and R' are equal re complicated dx 3 29. 30. dy 1+ 4x² +25y2 31. 2 8x+6 dx,. > dx 32. 2r2+3x 32.30 method Find the foll