I.4.45 Curvilinear Integrals

Condition: Calculate the curved integral \ [\ int_ {l_ {a b}}} (x y-x) d X+\ frac {1} {2} x^{2} d y \] where \ (l_ {a b}- \) the parabola \ {2} = 4 x \) from the point from the point of the point from the point \ (A (0; 0) \) to the point \ (b (1; 2) \).