1. S, x2 19 + 23 da = f Y du, after doing the substitution given by u = 19 + x3. O False O True 2. Evaluate the definite integral using the substitution u = cos(x). 7/6 - tan(x) dx = 0-3 O V3 O - In(6) + 3 O : In(3) O In( $5)3. Evaluate the definite integral. 7/ - cot2(x) dac = O 2 + V3 6 2 3V/3 O V3 4. The integral S2 2 In | ac / 4| tan '(x) + cos(x) dx, when evaluated, gives a positive number. O True O False