I need solve this questions of calculus III

Question [30 points]: Show all your work. a) [10 points]: Evaluate (x + 3) Vx - 3dx b) [10 points]: If - f(x)dx = ~In(1x[) - -sec(x) - 4e4 + - 1 2 + 6x + C N then find f(x). c) [10 points]: Estimate the area under the graph of f (x) = x2 - 1 from x = 1 to x = 3 using four approximationectangles and midpoints