Could you help me with this question please?

13. (10 points) (a) (5 points) Directly compute (without using Green's Theorem) Sc F(x, y) . dr, where F(x, y) = (y2, -xy) and C is the unit circle traversed counterclockwise. (b) (5 points) Use Green's Theorem (see the Theorem on the last page) to evaluate the line integral in part (a)