Let F(x)=∫ sin(t^2) dt from 0 to x for 0≤x≤3. a) Use the Trapezoidal Rule with four equal subdivisions of the closed interval [0, 2] to approximate F(2). b) On what interval or intervals is F increasing? Justify your answer. c) If the average rate of change of F on the closed interval [0, 3] is k, find ∫ sin(t^2) dt from 0 to 3 in terms of k.