Find the circulation and flux of the field F = xi+yj around and across the closed semicircular path that consists of the semicircular arch r₁(t)=(a cost)i + (a sin t)j, 0 ≤t≤л, followed by the line segment r2(t) = ti, ast≤a. The circulation is (Type an exact answer, using it as needed.) The flux is (Type an exact answer, using л as needed.)