i.12.2 Vector field circulation

Condition: Calculate the circulation of the vector field \( \bar{a} \) through the closed contour Г, specified parametrically: \[ \bar{a}=x \bar{\imath}+x \bar{\jmath}+z \bar{k} \] \[ \Gamma:\left\{\begin{array}{c} x=\cos t \\ y=2 \sin t \quad t \in[0 ; 2 \pi] \\ z=3 \end{array}\right. \]