Find the area enclosed by the given ellipse. x = a cost, y = b sint, 0sts 2x The area is (Type an expression using a and b as the variables. Type an exact answer, using It as needed.)Find the length of the curve. 12 (21 + 1)312 X= 2 y = 3 . Osts 12 The length of the curve is (Simplify your answer.)Find the length of the curve. x = 9 cost + 9t sint, y =9 sint - 9t cost, Osts NIH The length is |units. (Type an exact answer, using it as needed.)Find the area of the surface generated by revolving x = t+ 16. y = _ + +6t+1, -16 sts :6 about the y-axis. The surface area obtained by revolving the given curve around the y-axis is (Type an exact answer in terms of I.)