In problems 28 - 34, use a method of integration covered this week to find the value of the definite integral. (When using u-sub, be sure to write your "u", "du", and anything else necessary. 3 sin 20 28. dx 2 Vx4 29. de -8 - TC COs O 6 TT 2 5 TC 16 5 6 30. dx 31. V3 sec2 x - 2 sec x tan x dx TT 2 Vx cos2 ( Vx) 2 TC 36 3 13 - 6 X 32. dx 33. x V3x - 2 dx 83x2 + 5 sin x if 0Exs 34. f(x) dx where f(x) = cot2 x if