I.4.30 Curvilinear Integrals

Condition: calculate the curved integral by a curve set parametrically (from the first specified point to the second). \ [\ int_ {l} y d x+z d y- \ frac {1} {2} y d z, \ quad \ text {where} l: x = \ cos t \] \ [y = \ sin t, z = 2-2 \ cos t_ {1} = 0, t_ {2} = \ frac {\ pi} {4} \]