(a) Consider the closed cure C give by y=sin[x] and y=2sin[x] for 0≤ x ≤π, oriented in the counterclockwise sense, and the vector field F: R²--->R² : (x,y)-->(1+y², y) Evaluate the line Integral ∫(C) F*ds. (b) Evaluate the double integral ∫ ∫(D) (-2y)dxdy, where D is the region enclosed by the curve C from part(a).