Line Integral Homework: Solving for the Result Along the x-Axis

[-EquinoX-]

Homework Statement

http://img7.imageshack.us/img7/1764/capkgc.th.jpg

Homework Equations

The Attempt at a Solution

Okay I already got the result for the line integral along the circle, but I am confused how to get the line integral in the x-axis? To get the final result I just need to add both, right?

 

[Billy Bob]

Could try x=t for $$0\le t\le 6$$ and $$y\equiv 0$$. Then add both, as you said.

OR, try another method. Is the integral path independent?

 

[-EquinoX-]

yes I guess..it's path independent