1. Calculate the data line integrals (1-4)

Where LOB - arc of a parabola y = x2 from point O (0, 0) to point B (1, 1).

Where L - the circle x2 + y2 = 2y.

Where LOABC - rectangular contour with vertices at point O (0, 0, 0), A (0, 4, 0), B (0, 4, 2), C (0, 0, 2).

Where L - the arc of the ellipse x = 6cost, y = 4sint at the positive direction bypass circuit.

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