Find the most general f. Use C for the constant of the first anti-derivative and D for the constant of the second anti-derivative. f \'\'(x) = 4x + sin x Solution f\'(x) = int f\"(x) = int 4x+sin(x) dx = 2x2 - cos(x) + C1 f(x) = int f\'(x) dx = int 2x2 - cos(x) + C1 dx = 2/3 x3 - sin(x) + C1x + C2 where C1 and C2 are constants..