Evaluate (3x, cosy) - dr where C is the rectangle with vertices (0, 0), (, 0), (, 2), (0, 2). Y Evaluate fe dx + dy where C' is the curve given by r(t) = (t, t + 1), 0 t 3. Evaluate Sff(x + yjd where E is the region inside the cylinder of radius 2 with center along the x-axis and inside the sphere of radius 4 centered at the origin.