Evaluate the scalar or vector line integral of each function over the given curve. You may use a calculator or computer to perform the integration after setting up the integral (for this problem only!). (a) f(x, y) = x^2 over the circle of radius 3 centered at the origin. (b) F(x, y) = [x, y^2 ] over the curve x = y^3 from (8, 2) to (8, 2). (c) F(x, y, z) = (y^2z + e^z )i 2xyzj + (xy^2 + xe^z )k over the helix parameterized by r(t) = [2cost, 2sint, t] for 0 t