18. If x? + 2xy = y? then y' is x+y b. 2x + 2y a. y-x d. -x C. y 19. Evaluate S(3VE+ dx a. 2x + 4 V + C b.x Vã + 2 vĩ + C c. 3xvx + 4 Vx + C d. 3x Vx + 2 Vx + C

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