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 cos t)i + (a sin t)j, 0≤t≤, followed by the line segment r₂(t)= ti, -a≤t≤a. The circulation is. (Type an exact answer, using à as needed.)

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