Exercise 4: A particle moves along a line so that its velocity at time tis vij = {" -at -3, at 5 4Exorcise 7: Sketch the region enclosed by the curves and find its area: y=12-x,y=2-6Exercise 8: Find the area of the region bounded by the curves y = sin x, y = cos x, x = 0, and x = 2)