Choose the letter that corresponds to your answer. If your answer is not amongthe choices, choose E.

15. The integral In a dx can be best evaluated by (A) integration by algebraic substitution (C) integration ny partial fraction (B) integration by parts (D) integration by trigonometric substitution 16. Evaluate (A) axl + C (C) 3 10" 10 (B) 1 528 + 3 10 (D) - 3x + Ixl + C 17. Evaluate sin (2x)dx Vsin2 x - 3 (A) 2v sin2 x - 3 + C (C) -Vsin?x - 3 + C 2 (B) : + C Vsin2 x - 3 (D) Vsin2 x - 3 + C 18. Let 6x3 - 4x2 - 8x - 2 A B(2x) + E (2x + 1)(x2 + 1)(x - 1) - da = 2 + it + x2 +1 dx. What is the value of A? (A) O ( B) 1 (C) 2 (D) 3 19. Let 6x3 - 4x2 - 8x - 2 dx = A B(2x) + E F (2x + 1) (x2 + 1)(x - 1) 2x + 1 + x2 + 1 + dr. What is the value of E? (A) O (B) 1 (C) 2 (D 3 6x3 - 4x2 -8x - 2 20. Let dx = A B(2x) + E + F (2x + 1)(x2 + 1)(x -1) 2x + 1 + x2 + 1 x - 1 dr. What is the value of B? (A) O (B 1 (C) 2 (D 3