2-6 Use Stokes' Theorem to evaluate curl F 2. F(x, y, z) = x 2 sin z 1 + y"j + xy k. . dS. å¯ (b) S is the part of the paraboloid z = 1-x2-y2 that lies above the xy-plane, oriented upward 3. F(x, y, z) = ze/i + x cos y j + xz sin y k, (c) F S is the hemisphere x 2 + y 2 + z 2 = 16, y the direction of the positive y-axis 0, oriented in 13-15 Ve